CVE-2026-44950 (GCVE-0-2026-44950)
Vulnerability from cvelistv5 – Published: 2026-09-10 08:19 – Updated: 2026-09-10 18:26
VLAI
EPSS
VEX
Title
fs_read_glyphs() heap buffer overflow via cumulative glyph data overflow in libXfont2
Summary
fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.
A malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content.
Severity
9 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 17:19 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
1 reference
Impacted products
80 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| SUSE | Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Container suse/kiosk/xorg:21.1-83.7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Azure-3P |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAP-Hardened-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP6-SAPCAL-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Azure-3P |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-GCE-3P |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-BYOS-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAP-Hardened-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAPCAL-Azure |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAPCAL-EC2 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES15-SP7-SAPCAL-GCE |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-Azure |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-Azure-3P |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-BYOS-Azure |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-BYOS-EC2 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-BYOS-GCE |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-GCE |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAP-GCE-3P |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES-SAPCAL-GCE |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-Azure-SAP-BYOS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-Azure-SAP-On-Demand |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-EC2-SAP-BYOS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-EC2-SAP-On-Demand |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-GCE-SAP-BYOS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | Image SLES12-SP5-GCE-SAP-On-Demand |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Liberty Linux 10 |
Affected:
? , < 2.0.6-5.el10_2.3
(custom)
|
guessed | |
| SUSE | SUSE Liberty Linux 8 |
Affected:
? , < 2.0.3-2.el8_10.3
(custom)
|
guessed | |
| SUSE | SUSE Liberty Linux 9 |
Affected:
? , < 2.0.3-12.el9_8.3
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Desktop 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Module for Basesystem 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP7 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 12 SP5-LTSS |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP4-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP5-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 15 SP6-LTSS |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server 16.0 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP applications 16.0 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 |
Affected:
? , < 2.0.3-3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP4 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP5 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Linux Enterprise Server for SAP Applications 15 SP6 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Manager Proxy LTS 4.3 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Manager Retail Branch Server LTS 4.3 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | SUSE Manager Server LTS 4.3 |
Affected:
? , < 2.0.3-150000.3.6.1
(custom)
|
guessed | |
| SUSE | openSUSE Leap 16.0 |
Affected:
? , < 2.0.7-160000.5.1
(custom)
|
guessed | |
| SUSE | openSUSE Tumbleweed |
Affected:
? , < 2.0.7-3.1
(custom)
|
guessed | |
| libXfont | libXfont |
Affected:
? , ≤ 2.0.8
(custom)
|
guessed |
Date Public
2026-08-05 08:17
{
"containers": {
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"metrics": [
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"other": {
"content": {
"id": "CVE-2026-44950",
"options": [
{
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{
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{
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{
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{
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"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-BYOS-GCE",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
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"version": "?",
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
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},
{
"defaultStatus": "unaffected",
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"vendor": "SUSE",
"versions": [
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{
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{
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{
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"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-Hardened-BYOS-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
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},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
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"versions": [
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"lessThan": "2.0.3-150000.3.6.1",
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{
"defaultStatus": "unaffected",
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"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
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"version": "?",
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]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAP-Hardened-GCE",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL-Azure",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL-EC2",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
"product": "Image SLES15-SP6-SAPCAL-GCE",
"vendor": "SUSE",
"versions": [
{
"lessThan": "2.0.3-150000.3.6.1",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client",
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\"versionType\": \"custom\"}], \"packageName\": \"libXfont2-devel\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"SUSE\", \"product\": \"openSUSE Leap 16.0\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"lessThan\": \"2.0.7-160000.5.1\", \"versionType\": \"custom\"}], \"packageName\": \"libXfont2-2\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"SUSE\", \"product\": \"openSUSE Leap 16.0\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"lessThan\": \"2.0.7-160000.5.1\", \"versionType\": \"custom\"}], \"packageName\": \"libXfont2-devel\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"SUSE\", \"product\": \"openSUSE Tumbleweed\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"lessThan\": \"2.0.7-3.1\", \"versionType\": \"custom\"}], \"packageName\": \"libXfont2-2\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"SUSE\", \"product\": \"openSUSE Tumbleweed\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"lessThan\": \"2.0.7-3.1\", \"versionType\": \"custom\"}], \"packageName\": \"libXfont2-2-32bit\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"SUSE\", \"product\": \"openSUSE Tumbleweed\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"lessThan\": \"2.0.7-3.1\", \"versionType\": \"custom\"}], \"packageName\": \"libXfont2-devel\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"SUSE\", \"product\": \"openSUSE Tumbleweed\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"lessThan\": \"2.0.7-3.1\", \"versionType\": \"custom\"}], \"packageName\": \"libXfont2-devel-32bit\", \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"libXfont\", \"product\": \"libXfont\", \"versions\": [{\"status\": \"affected\", \"version\": \"?\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"2.0.8\"}], \"packageName\": \"libXfont\", \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-08-05T08:17:00.000Z\", \"references\": [{\"url\": \"https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950\"}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph\u0027s bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\\n\\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cpre\u003efs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph\u0027s bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\\n\\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content.\u003c/pre\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"404e59f5-483d-4b8a-8e7a-e67604dd8afb\", \"shortName\": \"suse\", \"dateUpdated\": \"2026-09-10T08:19:55.462Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-44950\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-10T18:26:50.408Z\", \"dateReserved\": \"2026-05-08T12:29:48.969Z\", \"assignerOrgId\": \"404e59f5-483d-4b8a-8e7a-e67604dd8afb\", \"datePublished\": \"2026-09-10T08:19:55.462Z\", \"assignerShortName\": \"suse\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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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.
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.
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