CVE-2016-10012
CVE-2016-10012 is a high-severity vulnerability in Openbsd Openssh with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v2: 7.2
- EPSS exploit prediction: 1% (67th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-119
- Affected product: Openbsd Openssh
- Published:
- Last modified:
Description
The shared memory manager (associated with pre-authentication compression) in sshd in OpenSSH before 7.4 does not ensure that a bounds check is enforced by all compilers, which might allows local users to gain privileges by leveraging access to a sandboxed privilege-separation process, related to the m_zback and m_zlib data structures.
Frequently asked questions
- What is CVE-2016-10012?
- The shared memory manager (associated with pre-authentication compression) in sshd in OpenSSH before 7.4 does not ensure that a bounds check is enforced by all compilers, which might allows local users to gain privileges by leveraging access to a sandboxed privilege-separation process, related to the m_zback and m_zlib data structures.
- How severe is CVE-2016-10012?
- CVE-2016-10012 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2016-10012 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2016-10012?
- CVE-2016-10012 affects Openbsd Openssh. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2016-10012?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2016-10012 published?
- CVE-2016-10012 was published on 2017-01-05 and last updated on 2026-06-17.
References
- http://www.openwall.com/lists/oss-security/2016/12/19/2
- http://www.securityfocus.com/bid/94975
- http://www.securitytracker.com/id/1037490
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.647637
- https://access.redhat.com/errata/RHSA-2017:2029
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://github.com/openbsd/src/commit/3095060f479b86288e31c79ecbc5131a66bcd2f9
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
- https://security.netapp.com/advisory/ntap-20171130-0002/
- https://support.f5.com/csp/article/K62201745?utm_source=f5support&%3Butm_medium=RSS
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03818en_us
- https://www.openssh.com/txt/release-7.4
Affected products (1)
- cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
More vulnerabilities in Openbsd Openssh
- CVE-2003-0786 — Critical (CVSS 10.0): The SSH1 PAM challenge response authentication in OpenSSH 3.7.1 and 3.7.1p1, when Privilege Separation is disabled,…
- CVE-2003-0693 — Critical (CVSS 10.0): A "buffer management error" in buffer_append_space of buffer.c for OpenSSH before 3.7 may allow remote attackers to…
- CVE-2002-0640 — Critical (CVSS 10.0): Buffer overflow in sshd in OpenSSH 2.3.1 through 3.3 may allow remote attackers to execute arbitrary code via a large…
- CVE-2001-0144 — Critical (CVSS 10.0): CORE SDI SSH1 CRC-32 compensation attack detector allows remote attackers to execute arbitrary commands on an SSH…
- CVE-2000-0999 — Critical (CVSS 10.0): Format string vulnerabilities in OpenBSD ssh program (and possibly other BSD-based operating systems) allow attackers…
- CVE-2000-0525 — Critical (CVSS 10.0): OpenSSH does not properly drop privileges when the UseLogin option is enabled, which allows local users to execute…
All CVEs affecting Openbsd Openssh →
Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities
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- CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
- CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
- CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
- CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
- CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.
Threat intelligence
Threat-intel indicators referencing this CVE:
- 122.114.69.235 (ipv4-addr)
- 92.47.46.174 (ipv4-addr)
- 76.12.128.249 (ipv4-addr)
- 64.53.7.231 (ipv4-addr)
- 62.182.118.138 (ipv4-addr)
- 61.76.136.25 (ipv4-addr)
- 213.135.175.76 (ipv4-addr)
- 187.237.47.214 (ipv4-addr)