CVE-2021-22555 (GCVE-0-2021-22555)
Vulnerability from cvelistv5 – Published: 2021-07-07 11:20 – Updated: 2025-12-30 20:32Title
Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE
Summary
A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space
Severity
8.3 (High)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-04 03:55 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://github.com/google/security-research/secur… | x_refsource_MISC |
| https://git.kernel.org/pub/scm/linux/kernel/git/t… | x_refsource_MISC |
| https://git.kernel.org/pub/scm/linux/kernel/git/t… | x_refsource_MISC |
| http://packetstormsecurity.com/files/163528/Linux… | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021080… | x_refsource_CONFIRM |
| http://packetstormsecurity.com/files/163878/Kerne… | x_refsource_MISC |
| http://packetstormsecurity.com/files/164155/Kerne… | x_refsource_MISC |
| http://packetstormsecurity.com/files/164437/Netfi… | x_refsource_MISC |
| http://packetstormsecurity.com/files/165477/Kerne… | x_refsource_MISC |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| n/a | Linux Kernel |
Affected:
2.6.19-rc1 , < unspecified
(custom)
|
Date Public
2021-07-04 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c266ced1-d925-4e85-abed-4ecb621aaa53
Exploited: Yes
Timestamps
First Seen: 2025-10-06
Asserted: 2025-10-06
Scope
Notes: KEV entry: Linux Kernel Heap Out-of-Bounds Write Vulnerability | Affected: Linux / Kernel | Description: Linux Kernel contains a heap out-of-bounds write vulnerability that could allow an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2025-10-27 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21 ; https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d ; https://security.netapp.com/advisory/ntap-20210805-0010/ ; https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528 ; https://nvd.nist.gov/vuln/detail/CVE-2021-22555
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-787 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Kernel |
| Due Date | 2025-10-27 |
| Date Added | 2025-10-06 |
| Vendorproject | Linux |
| Vulnerabilityname | Linux Kernel Heap Out-of-Bounds Write Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 12:25 UTC
| Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 838f9894-2394-4cdb-adc5-3bd8b555ff5d
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE | Affected: Linux / Linux Kernel | CVSS: 8.3 (HIGH) | EPSS: 0.78684 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE |
| Vendor | Linux |
| Product | Linux Kernel |
| Added Date | 2026-06-01T10:41:42.825Z |
| Cvss Score | 8.3 |
| Epss Score | 0.78684 |
| Cvss Severity | HIGH |
| Epss Percentile | 0.99537 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:03 UTC
| Updated: 2026-07-10 06:14 UTC
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"version": {
"version_data": [
{
"version_affected": "\u003e=",
"version_value": "2.6.19-rc1"
}
]
}
}
]
},
"vendor_name": "n/a"
}
]
}
},
"credit": [
{
"lang": "eng",
"value": "Andy Nguyen"
}
],
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space"
}
]
},
"generator": {
"engine": "Vulnogram 0.0.9"
},
"impact": {
"cvss": {
"attackComplexity": "HIGH",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-787 Out-of-bounds Write"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528",
"refsource": "MISC",
"url": "https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528"
},
{
"name": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21",
"refsource": "MISC",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21"
},
{
"name": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d",
"refsource": "MISC",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d"
},
{
"name": "http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.html",
"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.html"
},
{
"name": "https://security.netapp.com/advisory/ntap-20210805-0010/",
"refsource": "CONFIRM",
"url": "https://security.netapp.com/advisory/ntap-20210805-0010/"
},
{
"name": "http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.html",
"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.html"
},
{
"name": "http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html",
"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html"
},
{
"name": "http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.html",
"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.html"
},
{
"name": "http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html",
"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html"
}
]
},
"source": {
"discovery": "UNKNOWN"
}
}
}
},
"cveMetadata": {
"assignerOrgId": "14ed7db2-1595-443d-9d34-6215bf890778",
"assignerShortName": "Google",
"cveId": "CVE-2021-22555",
"datePublished": "2021-07-07T11:20:10.668Z",
"dateReserved": "2021-01-05T00:00:00.000Z",
"dateUpdated": "2025-12-30T20:32:33.647Z",
"state": "PUBLISHED"
},
"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.
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.
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