CVE-2011-2534

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

Buffer overflow in the clusterip_proc_write function in net/ipv4/netfilter/ipt_CLUSTERIP.c in the Linux kernel before 2.6.39 might allow local users to cause a denial of service or have unspecified other impact via a crafted write operation, related to string data that lacks a terminating '\0' character.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
37.5%
KEV
Not listed

Published

June 22, 2011

Last Modified

April 29, 2026

Advisory Details (8)

Auto-updated May 2, 2026
Patch available. Sources: redhat.
redhat Patch Available

689337 – (CVE-2011-2534) CVE-2011-2534 ipv4: netfilter: ipt_CLUSTERIP: fix buffer overflow

Affected: Red Hat Enterprise Linux 4 as it did not have support for ipt_CLUSTERIP. This has been addressed in Red Hat Enterprise Linux 5

https://bugzilla.redhat.com/show_bug.cgi?id=689337
generic
http://www.securityfocus.com/bid/46921
generic

oss-security - Re: CVE request: kernel: netfilter & econet infoleaks

http://www.openwall.com/lists/oss-security/2011/03/21/4
generic

oss-security - Re: CVE request: kernel: netfilter & econet infoleaks

http://www.openwall.com/lists/oss-security/2011/03/21/1
generic

oss-security - CVE request: kernel: netfilter & econet infoleaks

http://www.openwall.com/lists/oss-security/2011/03/18/15
generic

linux kernel 2.6.38.8 ipv4 ipt_CLUSTERIP buffer overflow - CXSecurity.com

http://securityreason.com/securityalert/8284
generic

'[PATCH v2] ipv4: netfilter: ipt_CLUSTERIP: fix buffer overflow' - MARC

http://marc.info/?l=netfilter-devel&m=130036157327564&w=2
generic

'[PATCH] ipv4: netfilter: ipt_CLUSTERIP: fix buffer overflow' - MARC

http://marc.info/?l=netfilter&m=129978077509888&w=2

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-2.6.35-903-omap4 (2.6.35-903.24) @ maverick2026-05-29ubuntu
ubuntulinux-image-2.6.35-30-powerpc (2.6.35-30.54) @ maverick2026-05-29ubuntu
ubuntulinux-image-2.6.24-29-lpiacompat (2.6.24-29.92) @ hardy2026-05-29ubuntu
ubuntulinux-image-2.6.35-30-virtual (2.6.35-30.56~lucid1) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.38-1209-omap4 (2.6.38-1209.15) @ natty2026-05-29ubuntu
ubuntulinux-image-2.6.32-32-sparc64 (2.6.32-32.62) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.32-417-dove (2.6.32-417.34) @ maverick2026-05-29ubuntu
ubuntulinux-image-2.6.32-217-dove (2.6.32-217.34) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.31-610-imx51 (2.6.31-610.28) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.38-10-generic (2.6.38-10.46) @ natty2026-05-29ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(10)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 107 total refreshes for this CVE.

  1. 2026-07-23 01:05 UTCEG score recompute
  2. 2026-07-23 00:09 UTCEG score recompute
  3. 2026-07-22 21:47 UTCEG score recompute
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2011-2534?
CVE-2011-2534 is a high vulnerability published on June 22, 2011. Buffer overflow in the clusteripprocwrite function in net/ipv4/netfilter/ipt_CLUSTERIP.c in the Linux kernel before 2.6.39 might allow local users to cause a denial of service or have unspecified other impact via a crafted write operation, related to string data that lacks a terminating '\0'…
When was CVE-2011-2534 disclosed?
CVE-2011-2534 was first published in the National Vulnerability Database on June 22, 2011, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-2534 actively exploited?
CVE-2011-2534 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2011-2534?
CVE-2011-2534 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2011-2534?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-2534, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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