CVE-2021-22555 (GCVE-0-2021-22555)

Vulnerability from cvelistv5 – Published: 2021-07-07 11:20 – Updated: 2025-12-30 20:32
VLAI CISA KEV
Title
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)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a Linux Kernel Affected: 2.6.19-rc1 , < unspecified (custom)
Date Public
2021-07-04 00:00
Credits
Andy Nguyen
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c266ced1-d925-4e85-abed-4ecb621aaa53

Vulnerability ID: CVE-2021-22555

Status: Confirmed

Status Updated: 2025-10-06 00:00 UTC

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
Show details on NVD website
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      "id": "CVE-2021-22555",
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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.