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NVD / CVE Program· CNA redhat

CVE-2012-0804: Heap-based buffer overflow in the proxy_connect function in src/client.c in CVS 1.11 and 1.12 allows remote HTTP proxy servers to cause a…

CriticalCVSS 10.0 · v2.0—No exploit Fix available

Noroxi assessment

Priority: Plan (action score 43/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 8.3% (FIRST EPSS); higher than 95% of all records.
  • No special conditions are required; it is repeatable.
  • Fixed version: cvs (Alpine:v3.10) 1.12.12-r0; cvs (Debian:12) 2:1.12.13+real-7; cvs (Debian:6.0) 1:1.12.13-12+squeeze1.

Add it to your regular patch cycle. Upgrade to cvs (Alpine:v3.10) 1.12.12-r0; cvs (Debian:12) 2:1.12.13+real-7; cvs (Debian:6.0) 1:1.12.13-12+squeeze1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Heap-based buffer overflow in the proxy_connect function in src/client.c in CVS 1.11 and 1.12 allows remote HTTP proxy servers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted HTTP response.

Published
May 29, 2012
Updated
Jun 16, 2026
EPSS
8.3% · 95th percentile

Report tools

JSON

Action score

43

Plan

Add it to your regular patch cycle.

CVSS
40 / 40 · 10.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
3 / 30 · 8.3%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
cvscvs

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • cvs cvs1.11
  • cvs cvs1.12

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10cvsbefore 1.12.12-r01.12.12-r0
Debian:12cvsbefore 2:1.12.13+real-72:1.12.13+real-7
Debian:6.0cvsbefore 1:1.12.13-12+squeeze11:1.12.13-12+squeeze1
openSUSE:Tumbleweedcvsbefore 1.12.12-183.101.12.12-183.10
Red Hat:enterprise_linux:5::clientcvsbefore 0:1.11.22-11.el5_8.10:1.11.22-11.el5_8.1
Red Hat:enterprise_linux:5::clientcvs-debuginfobefore 0:1.11.22-11.el5_8.10:1.11.22-11.el5_8.1
Red Hat:enterprise_linux:5::clientcvs-inetdbefore 0:1.11.22-11.el5_8.10:1.11.22-11.el5_8.1
Red Hat:enterprise_linux:6::clientcvsbefore 0:1.11.23-11.el6_2.10:1.11.23-11.el6_2.1
Red Hat:enterprise_linux:6::clientcvs-debuginfobefore 0:1.11.23-11.el6_2.10:1.11.23-11.el6_2.1

Same product

cvs: all records

Other highest-scoring records for the same primary product.

  • CVE-2004-0396Heap-based buffer overflow in CVS 1.11.x up to 1.11.15, and 1.12.x up to 1.12.7, when using the pserver mechanism allows remote attackers…
    50Plan
  • CVE-2004-0416Double free vulnerability for the error_prog_name string in CVS 1.12.x through 1.12.8, and 1.11.x through 1.11.16, may allow remote…
    44Plan
  • CVE-2004-0418serve_notify in CVS 1.12.x through 1.12.8, and 1.11.x through 1.11.16, does not properly handle empty data lines, which may allow remote…
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2005-0753Apr 18, 2005 · Buffer overflow in CVS before 1.11.20 allows remote attackers to execute arbitrary code.
    31Monitor
  • ← EarlierCVE-2004-1342Apr 27, 2005 · CVS 1.12 and earlier on Debian GNU/Linux, when using the repouid patch, allows remote attackers to bypass authentication via the pserver…
    31Monitor
  • ← EarlierCVE-2005-2693Aug 26, 2005 · cvsbug in CVS 1.12.12 and earlier creates temporary files insecurely, which allows local users to overwrite arbitrary files and execute…
    18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:cvs1.12.12-r0 · Alpine:v3.10Package registry (OSV)
debian:cvs2:1.12.13+real-7 · Debian:12Package registry (OSV)
opensuse:cvs1.12.12-183.10 · openSUSE:TumbleweedPackage registry (OSV)
red hat:cvs0:1.11.22-11.el5_8.1 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:cvs-debuginfo0:1.11.22-11.el5_8.1 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:cvs-inetd0:1.11.22-11.el5_8.1 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
C · data can be read
Integrity
C · data or configuration can be modified
Availability
C · the service can be disrupted
Attack complexity
Low
Confidentiality impact
C
Integrity impact
C
Availability impact
C

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (14 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records