CVE-2016-0739

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2022-05-17. NVD baseline CVSS 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 5.9Exploit: None knownExposed: 0

A fix is available — apply it.

libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."

CVSS v3
5.9
EG Score
5.9(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
Severity59% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
83%
KEV
Not listed

Published

April 13, 2016

Last Modified

June 17, 2026

References (20)

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibssh-4 (0.5.2-1ubuntu0.12.04.6) @ precise2026-05-22ubuntu
redhatlibssh-0:0.7.1-2.el72016-03-31redhat

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

(7 across 7 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libssh—0.6.3-4.3—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libssh—0.6.3-4.3—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libssh—0.6.3-4.3—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libssh—0.6.3-4.3—
Debian:6.0(1)
PackageVulnerable rangeFixed inDependents
libssh0.4.5-3, 0.4.5-3+squeeze1, 0.4.5-3+squeeze20.4.5-3+squeeze3—
Debian:7(1)
PackageVulnerable rangeFixed inDependents
libssh0.5.4-1, 0.5.4-1+deb7u1, 0.5.4-1+deb7u20.5.4-1+deb7u3—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
libssh0.6.3-4, 0.6.3-4+deb8u10.6.3-4+deb8u2—

Weakness Classification(1)

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 6× in last 7d / 27× 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 126 total refreshes for this CVE.

  1. 2026-08-20 22:50 UTCEPSS rescore
  2. 2026-08-19 16:59 UTCEPSS rescore
  3. 2026-08-18 13:43 UTCEPSS rescore
  4. 2026-08-16 14:51 UTCEPSS rescore
  5. 2026-08-16 02:09 UTCEPSS rescore
  6. 2026-08-15 01:25 UTCEPSS rescore
  7. 2026-08-14 12:54 UTCOSV refresh
  8. 2026-08-12 13:46 UTCEPSS rescore
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  11. 2026-08-08 16:32 UTCEPSS rescore
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  17. 2026-08-01 04:11 UTCEPSS rescore
  18. 2026-07-30 01:26 UTCEPSS rescore
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  20. 2026-07-30 01:24 UTCOSV refresh
  21. 2026-07-28 15:31 UTCEPSS rescore
  22. 2026-07-26 14:50 UTCEPSS rescore
  23. 2026-07-25 14:13 UTCEPSS rescore
  24. 2026-07-24 14:13 UTCEPSS rescore
  25. 2026-07-23 14:14 UTCEPSS rescore
Show 75 more
  1. 2026-07-23 01:20 UTCEG score recompute
  2. 2026-07-23 00:22 UTCEG score recompute
  3. 2026-07-22 22:00 UTCEG score recompute
  4. 2026-07-22 14:04 UTCEPSS rescore
  5. 2026-07-21 15:21 UTCEPSS rescore
  6. 2026-07-21 15:21 UTCEPSS rescore
  7. 2026-07-20 17:03 UTCEPSS rescore
  8. 2026-07-19 14:27 UTCEPSS rescore
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  10. 2026-07-19 02:26 UTCEPSS rescore
  11. 2026-07-19 02:26 UTCEPSS rescore
  12. 2026-07-18 10:00 UTCEPSS rescore
  13. 2026-07-16 16:59 UTCEPSS rescore
  14. 2026-07-15 16:54 UTCEPSS rescore
  15. 2026-07-15 16:54 UTCEPSS rescore
  16. 2026-07-15 01:56 UTCEPSS rescore
  17. 2026-07-13 22:26 UTCEPSS rescore
  18. 2026-07-13 22:26 UTCEPSS rescore
  19. 2026-07-12 10:38 UTCOSV refresh
  20. 2026-07-12 05:42 UTCEPSS rescore
  21. 2026-07-11 08:23 UTCEPSS rescore
  22. 2026-07-09 19:05 UTCEPSS rescore
  23. 2026-07-09 19:05 UTCEPSS rescore
  24. 2026-07-08 15:10 UTCEPSS rescore
  25. 2026-07-07 13:42 UTCEPSS rescore
  26. 2026-07-07 13:42 UTCEPSS rescore
  27. 2026-07-06 16:24 UTCEPSS rescore
  28. 2026-07-06 02:20 UTCEPSS rescore
  29. 2026-07-05 02:26 UTCEPSS rescore
  30. 2026-07-04 06:28 UTCEPSS rescore
  31. 2026-07-01 15:02 UTCEPSS rescore
  32. 2026-06-30 23:19 UTCEPSS rescore
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  36. 2026-06-28 14:04 UTCEPSS rescore
  37. 2026-06-28 04:53 UTCEPSS rescore
  38. 2026-06-27 03:05 UTCEPSS rescore
  39. 2026-06-25 13:47 UTCEPSS rescore
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  41. 2026-06-24 14:02 UTCEPSS rescore
  42. 2026-06-24 14:02 UTCEPSS rescore
  43. 2026-06-23 21:30 UTCEPSS rescore
  44. 2026-06-23 16:20 UTCOSV refresh
  45. 2026-06-22 14:23 UTCEPSS rescore
  46. 2026-06-22 14:23 UTCEPSS rescore
  47. 2026-06-21 14:54 UTCEPSS rescore
  48. 2026-06-21 14:54 UTCEPSS rescore
  49. 2026-06-21 01:57 UTCEPSS rescore
  50. 2026-06-21 01:57 UTCEPSS rescore
  51. 2026-06-19 19:23 UTCEPSS rescore
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  53. 2026-06-18 17:50 UTCEPSS rescore
  54. 2026-06-17 17:50 UTCEPSS rescore
  55. 2026-06-17 17:49 UTCEPSS rescore
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  58. 2026-06-15 17:45 UTCEPSS rescore
  59. 2026-06-14 23:14 UTCEPSS rescore
  60. 2026-06-13 22:57 UTCEPSS rescore
  61. 2026-06-12 23:09 UTCEPSS rescore
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  63. 2026-06-11 13:57 UTCEPSS rescore
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  65. 2026-06-10 22:15 UTCEPSS rescore
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  67. 2026-06-08 14:14 UTCEPSS rescore
  68. 2026-06-07 15:22 UTCEPSS rescore
  69. 2026-06-06 21:29 UTCOSV refresh
  70. 2026-06-06 13:45 UTCEPSS rescore
  71. 2026-06-05 22:44 UTCEPSS rescore
  72. 2026-06-04 13:10 UTCEPSS rescore
  73. 2026-06-04 13:10 UTCEPSS rescore
  74. 2026-06-02 20:10 UTCEPSS rescore
  75. 2026-06-01 13:49 UTCEPSS rescore

Frequently asked(5)

What is CVE-2016-0739?
CVE-2016-0739 is a medium vulnerability published on April 13, 2016. libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a…
When was CVE-2016-0739 disclosed?
CVE-2016-0739 was first published in the National Vulnerability Database on April 13, 2016, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-0739 actively exploited?
CVE-2016-0739 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 17.0% of all scored CVEs.
What is the CVSS score of CVE-2016-0739?
CVE-2016-0739 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2016-0739?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-0739, 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.

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