CVE-2015-6564

HIGHNVD 7.07.0—
EchelonGraph scoreMEDIUM confidence

Score 7.0 from GitHub Security Advisory published 2022-05-14. NVD baseline CVSS 7.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.0Exploit: None knownExposed: 0

A fix is available — apply it.

Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request.

CVSS v3
7.0
EG Score
7.0(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity70% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

August 24, 2015

Last Modified

May 27, 2026

Advisory Details (5)

Auto-updated Jul 17, 2026
No patch confirmed yet.
generic
http://www.securityfocus.com/bid/76317
generic

oss-security - Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities

http://www.openwall.com/lists/oss-security/2015/08/22/1
generic
http://www.openssh.com/txt/release-7.0
generic

Full Disclosure: BFS-SA-2015-002: OpenSSH PAM Privilege Separation Vulnerabilities

http://seclists.org/fulldisclosure/2015/Aug/54
generic
http://rhn.redhat.com/errata/RHSA-2016-0741.html

Vendor Advisories for CVE-2015-6564(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatopenssh-0:5.3p1-117.el62016-05-10redhat
redhatopenssh-0:6.6.1p1-22.el72015-11-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
openssh—1:6.9p1-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
openssh—1:6.9p1-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
openssh—1:6.9p1-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
openssh—1:6.9p1-1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
openssh1:6.7p1-5 ... 1:6.7p1-5+deb8u5 (6 versions)1:6.7p1-5+deb8u6—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 147 total refreshes for this CVE.

  1. 2026-09-19 15:35 UTCEPSS rescore
  2. 2026-09-18 19:22 UTCEPSS rescore
  3. 2026-09-17 19:21 UTCEPSS rescore
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  10. 2026-09-06 13:42 UTCEPSS rescore
  11. 2026-09-05 12:00 UTCOSV refresh
  12. 2026-09-04 13:55 UTCEPSS rescore
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  23. 2026-08-18 22:40 UTCOSV refresh
  24. 2026-08-18 13:43 UTCEPSS rescore
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  1. 2026-08-16 02:09 UTCEPSS rescore
  2. 2026-08-15 01:25 UTCEPSS rescore
  3. 2026-08-12 13:46 UTCEPSS rescore
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  5. 2026-08-09 13:42 UTCEPSS rescore
  6. 2026-08-08 16:32 UTCEPSS rescore
  7. 2026-08-07 16:22 UTCEPSS rescore
  8. 2026-08-06 13:42 UTCEPSS rescore
  9. 2026-08-05 19:12 UTCEPSS rescore
  10. 2026-08-04 15:04 UTCEPSS rescore
  11. 2026-08-04 10:31 UTCEPSS rescore
  12. 2026-08-03 18:27 UTCOSV refresh
  13. 2026-08-01 04:11 UTCEPSS rescore
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  20. 2026-07-23 14:14 UTCEPSS rescore
  21. 2026-07-23 01:19 UTCEG score recompute
  22. 2026-07-23 00:21 UTCEG score recompute
  23. 2026-07-22 21:59 UTCEG score recompute
  24. 2026-07-22 14:04 UTCEPSS rescore
  25. 2026-07-21 15:21 UTCEPSS rescore
  26. 2026-07-21 15:21 UTCEPSS rescore
  27. 2026-07-20 17:03 UTCEPSS rescore
  28. 2026-07-19 14:27 UTCEPSS rescore
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  32. 2026-07-18 10:00 UTCEPSS rescore
  33. 2026-07-17 06:50 UTCEG score recompute▲ 7.00
  34. 2026-07-17 06:50 UTCVendor advisory
  35. 2026-07-17 06:50 UTCGHSA enrichment
  36. 2026-07-16 16:59 UTCEPSS rescore
  37. 2026-07-15 16:54 UTCEPSS rescore
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  39. 2026-07-15 01:56 UTCEPSS rescore
  40. 2026-07-13 22:26 UTCEPSS rescore
  41. 2026-07-13 22:26 UTCEPSS rescore
  42. 2026-07-12 15:37 UTCOSV refresh
  43. 2026-07-12 05:42 UTCEPSS rescore
  44. 2026-07-11 08:23 UTCEPSS rescore
  45. 2026-07-09 19:05 UTCEPSS rescore
  46. 2026-07-09 19:05 UTCEPSS rescore
  47. 2026-07-08 15:10 UTCEPSS rescore
  48. 2026-07-07 13:42 UTCEPSS rescore
  49. 2026-07-07 13:42 UTCEPSS rescore
  50. 2026-07-06 16:24 UTCEPSS rescore
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  67. 2026-06-23 21:00 UTCOSV refresh
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  75. 2026-06-19 19:23 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2015-6564?
CVE-2015-6564 is a high vulnerability published on August 24, 2015. Use-after-free vulnerability in the mmanswerpamfreectx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITORREQPAMFREECTX request.
When was CVE-2015-6564 disclosed?
CVE-2015-6564 was first published in the National Vulnerability Database on August 24, 2015, with the most recent update on May 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-6564 actively exploited?
CVE-2015-6564 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.4% of all scored CVEs.
What is the CVSS score of CVE-2015-6564?
CVE-2015-6564 has a CVSS v3 base score of 7.0 (NVD).
How do I remediate CVE-2015-6564?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-6564, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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