CVE-2012-4559

mediumpriority · track · 29EPSS 0.052 · 92 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

5.18% (92nd) EPSS

CVSS 6.8 · medium

Is it mine?

8 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.8–7.5

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Psecondary · FSTEC (BDU) RU

v2.05.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:P/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-399USprimaryCWE-399US

affected products (8)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Gentoo Foundation Inc. Gentoo Linux≤ 20140826fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 6fstec_bduRU
libssh libssh≤ 0.5.2nvdUScpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*
libssh libssh= 0.4.7nvdUScpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*
libssh libssh= 0.4.8nvdUScpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*
libssh libssh= 0.5.0nvdUScpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*
libssh libssh= 0.5.1nvdUScpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*

also known as (8)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2012-11-30modified 2026-06-16

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+3721 more

references (31)

External citations — patches, advisories, analysis.

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