RHSA-2026:83657
Vulnerability from csaf_redhat - Published: 2026-10-15 21:36 - Updated: 2026-10-15 23:41Summary
Red Hat Security Advisory: wireshark security update
Severity
Moderate
Notes
Topic: An update for wireshark is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The wireshark packages contain a network protocol analyzer used to capture and browse the traffic running on a computer network.
Security Fix(es):
* wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash (CVE-2026-76886)
* wireshark: Wireshark: Denial of Service via RRC protocol dissector out-of-bounds write (CVE-2026-76880)
* wireshark: Wireshark: Denial of Service vulnerability in ESS protocol dissector (CVE-2026-76919)
* wireshark: Wireshark: Denial of Service vulnerability in H.245 protocol dissector (CVE-2026-76927)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in Wireshark. This vulnerability allows a remote attacker to cause a denial of service (DoS) by sending a specially crafted Universal Mobile Telecommunications System (UMTS) RRC protocol packet. The flaw resides in the UMTS RRC protocol dissector, which can lead to a crash of the Wireshark application. This can disrupt network analysis operations.
5.5 (Medium)
Affected products
Fixed
45 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-1:2.6.2-21.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-1:2.6.2-21.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-1:2.6.2-21.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-1:2.6.2-21.el8_10.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-1:2.6.2-21.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-cli-1:2.6.2-21.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-cli-1:2.6.2-21.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-cli-1:2.6.2-21.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-cli-1:2.6.2-21.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-cli-1:2.6.2-21.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-cli-debuginfo-1:2.6.2-21.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-cli-debuginfo-1:2.6.2-21.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-cli-debuginfo-1:2.6.2-21.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-cli-debuginfo-1:2.6.2-21.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-cli-debuginfo-1:2.6.2-21.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-debuginfo-1:2.6.2-21.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-debuginfo-1:2.6.2-21.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-debuginfo-1:2.6.2-21.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-debuginfo-1:2.6.2-21.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-debuginfo-1:2.6.2-21.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-debugsource-1:2.6.2-21.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-debugsource-1:2.6.2-21.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-debugsource-1:2.6.2-21.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-debugsource-1:2.6.2-21.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:wireshark-debugsource-1:2.6.2-21.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-cli-debuginfo-1:2.6.2-21.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-cli-debuginfo-1:2.6.2-21.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-cli-debuginfo-1:2.6.2-21.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-cli-debuginfo-1:2.6.2-21.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-cli-debuginfo-1:2.6.2-21.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-debuginfo-1:2.6.2-21.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-debuginfo-1:2.6.2-21.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-debuginfo-1:2.6.2-21.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-debuginfo-1:2.6.2-21.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-debuginfo-1:2.6.2-21.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-debugsource-1:2.6.2-21.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-debugsource-1:2.6.2-21.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-debugsource-1:2.6.2-21.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-debugsource-1:2.6.2-21.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-debugsource-1:2.6.2-21.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-devel-1:2.6.2-21.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-devel-1:2.6.2-21.el8_10.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-devel-1:2.6.2-21.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-devel-1:2.6.2-21.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-8.10.0.Z.MAIN.EUS:wireshark-devel-1:2.6.2-21.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in Wireshark. An unauthenticated remote attacker could exploit a vulnerability in the C12.22 protocol dissector by sending specially crafted network traffic. This could lead to a crash of the application, resulting in a Denial of Service (DoS).
5.3 (Medium)
Affected products
Fixed
45 products, the same list as for
CVE-2026-76880
Threats
Impact
Moderate
A flaw was found in Wireshark. A remote attacker could exploit a denial of service vulnerability in the ESS protocol dissector by processing a specially crafted network packet. This could lead to the application crashing, preventing network traffic analysis. The impact is limited to the availability of the Wireshark application itself.
6.5 (Medium)
Affected products
Fixed
45 products, the same list as for
CVE-2026-76880
Threats
Impact
Moderate
A flaw was found in Wireshark. A remote attacker could exploit a vulnerability in the H.245 protocol dissector. By crafting and sending malformed H.245 protocol data, an attacker could cause the Wireshark application to crash when a user processes this untrusted network data, leading to a denial of service.
6.5 (Medium)
Affected products
Fixed
45 products, the same list as for
CVE-2026-76880
Threats
Impact
Moderate
References
31 references
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"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
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"details": "Moderate"
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],
"title": "wireshark: Wireshark: Denial of Service via RRC protocol dissector out-of-bounds write"
},
{
"cve": "CVE-2026-76886",
"cwe": {
"id": "CWE-617",
"name": "Reachable Assertion"
},
"discovery_date": "2026-08-19T22:51:00.424021+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2520079"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Wireshark. An unauthenticated remote attacker could exploit a vulnerability in the C12.22 protocol dissector by sending specially crafted network traffic. This could lead to a crash of the application, resulting in a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate impact denial of service vulnerability in Wireshark\u0027s C12.22 protocol dissector could be triggered by processing a specially crafted capture file or analyzing malicious network traffic. Exploitation requires user interaction, such as opening a malicious file, limiting its impact in typical Red Hat deployments where Wireshark is used for network analysis rather than as a continuously exposed service.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-76886"
},
{
"category": "external",
"summary": "RHBZ#2520079",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520079"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-76886",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-76886"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-76886",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76886"
},
{
"category": "external",
"summary": "https://gitlab.com/wireshark/wireshark/-/work_items/21439",
"url": "https://gitlab.com/wireshark/wireshark/-/work_items/21439"
},
{
"category": "external",
"summary": "https://www.wireshark.org/security/wnpa-sec-2026-75.html",
"url": "https://www.wireshark.org/security/wnpa-sec-2026-75.html"
}
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"release_date": "2026-08-19T22:35:24.922000+00:00",
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{
"category": "vendor_fix",
"date": "2026-10-15T21:36:23+00:00",
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"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"details": "Moderate"
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],
"title": "wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash"
},
{
"cve": "CVE-2026-76919",
"cwe": {
"id": "CWE-457",
"name": "Use of Uninitialized Variable"
},
"discovery_date": "2026-08-19T23:01:29.046292+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2520093"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Wireshark. A remote attacker could exploit a denial of service vulnerability in the ESS protocol dissector by processing a specially crafted network packet. This could lead to the application crashing, preventing network traffic analysis. The impact is limited to the availability of the Wireshark application itself.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "wireshark: Wireshark: Denial of Service vulnerability in ESS protocol dissector",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate impact denial of service vulnerability affects Wireshark\u0027s ESS protocol dissector. An attacker can crash the application by providing a specially crafted network packet for analysis. The impact is limited to the availability of the Wireshark application, requiring user interaction to process the malicious input.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-76919"
},
{
"category": "external",
"summary": "RHBZ#2520093",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520093"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-76919",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-76919"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-76919",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76919"
},
{
"category": "external",
"summary": "https://gitlab.com/wireshark/wireshark/-/work_items/21467",
"url": "https://gitlab.com/wireshark/wireshark/-/work_items/21467"
},
{
"category": "external",
"summary": "https://www.wireshark.org/security/wnpa-sec-2026-86.html",
"url": "https://www.wireshark.org/security/wnpa-sec-2026-86.html"
}
],
"release_date": "2026-08-19T22:45:10.520000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-15T21:36:23+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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},
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"details": "Moderate"
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"title": "wireshark: Wireshark: Denial of Service vulnerability in ESS protocol dissector"
},
{
"cve": "CVE-2026-76927",
"cwe": {
"id": "CWE-476",
"name": "NULL Pointer Dereference"
},
"discovery_date": "2026-08-19T23:11:04.518175+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2520103"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Wireshark. A remote attacker could exploit a vulnerability in the H.245 protocol dissector. By crafting and sending malformed H.245 protocol data, an attacker could cause the Wireshark application to crash when a user processes this untrusted network data, leading to a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "wireshark: Wireshark: Denial of Service vulnerability in H.245 protocol dissector",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This localized Denial of Service vulnerability is rated Moderate because it solely causes application instability, leaving the underlying system and data secure. Furthermore, the exploit cannot trigger autonomously; it strictly requires a user to actively process crafted live network traffic or open a malicious capture file.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"url": "https://access.redhat.com/security/cve/CVE-2026-76927"
},
{
"category": "external",
"summary": "RHBZ#2520103",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520103"
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{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-76927"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-76927",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76927"
},
{
"category": "external",
"summary": "https://gitlab.com/wireshark/wireshark/-/work_items/21447",
"url": "https://gitlab.com/wireshark/wireshark/-/work_items/21447"
},
{
"category": "external",
"summary": "https://www.wireshark.org/security/wnpa-sec-2026-77.html",
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{
"category": "vendor_fix",
"date": "2026-10-15T21:36:23+00:00",
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]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "wireshark: Wireshark: Denial of Service vulnerability in H.245 protocol dissector"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.