CVE-2012-4561

Name: CVE-2012-4561
Creator: NVD / NIST
Published: 2012-11-30T22:55:01.72+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.75%

Last modified Jun 16, 2026

CVE-2012-4561 is a vulnerability of currently unknown severity. The (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (4) ssh_do_sign, and (5) ssh_sign_session_id functions in keys.c in libssh before 0.5.3 free "an invalid pointer on an error path," which might allow remote attackers to cause a denial of service (crash) via unspecified vectors.. EPSS estimates a 4.75% chance of exploitation in the next 30 days.

Description

The (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (4) ssh_do_sign, and (5) ssh_sign_session_id functions in keys.c in libssh before 0.5.3 free "an invalid pointer on an error path," which might allow remote attackers to cause a denial of service (crash) via unspecified vectors.

Metrics

EPSS Probability

4.75%

90.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Libssh	Libssh	<= 0.5.2
Libssh	Libssh	0.4.7
Libssh	Libssh	0.4.8
Libssh	Libssh	0.5.0
Libssh	Libssh	0.5.1

References

Timeline

Published: Nov 30, 2012
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2012-4561?

How severe is CVE-2012-4561?

Severity scoring for CVE-2012-4561 is pending analysis. The EPSS model estimates a 4.75% probability of exploitation in the next 30 days.

How do I fix CVE-2012-4561?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2012-4561?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST