Is CVE-2012-4559 in the CISA KEV catalog?

No. CVE-2012-4559 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2012-4559?

CVE-2012-4559 has a CVSS v2 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2012-4559?

CVE-2012-4559 has an EPSS score of 5.18% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2012-4559?

Upgrade libssh on debian 11 to 0.5.3-1 or later.

CVE & CISA-KEV Catalog

CVE-2012-4559

MEDIUMEPSS 91th pctl

6.8

CVSS v2

NVD

Description

Multiple double free vulnerabilities in the (1) agent_sign_data function in agent.c, (2) channel_request function in channels.c, (3) ssh_userauth_pubkey function in auth.c, (4) sftp_parse_attr_3 function in sftp.c, and (5) try_publickey_from_file function in keyfiles.c in libssh before 0.5.3 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors.

CWE-399Resource Management Errors

How to fix

Remediation Available

libsshDebian

Fixed in:0.5.3-1CVE-2012-4559

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

5.18%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Vendor Advisory1

libssh.org

Other references12

Related Vulnerabilities

Other CWE-399 (Resource Management Errors) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-3103	High	10.0	90%	-	-
CVE-2009-0075	High	9.3	85%	-	-
CVE-2005-1790	Low	2.6	83%	-	-
CVE-2010-0806	High	8.8	82%	KEV	-
CVE-2009-2526	High	7.8	82%	-	-
CVE-2015-1868	High	7.8	82%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.