CVE-2016-20012

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 5%CVSS: 5.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity53% × 45%
Exploitation5% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
91.8%
KEV
Not listed

Published

September 15, 2021

Last Modified

May 29, 2026

References (17)

Vendor Advisories for CVE-2016-20012(1)

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

Weakness Classification(1)

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

All Vendor Advisories

(1)

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 14× in last 7d / 44× 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.

  1. 2026-07-23 01:22 UTCEG score recompute
  2. 2026-07-22 22:01 UTCEG score recompute
  3. 2026-07-22 14:04 UTCEPSS rescore
  4. 2026-07-21 15:21 UTCEPSS rescore
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  10. 2026-07-18 11:59 UTCOSV refresh
  11. 2026-07-18 10:00 UTCEPSS rescore
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  1. 2026-07-06 16:24 UTCEPSS rescore
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  7. 2026-07-01 15:02 UTCEPSS rescore
  8. 2026-06-30 23:19 UTCEPSS rescore
  9. 2026-06-30 14:00 UTCOSV refresh
  10. 2026-06-29 14:03 UTCEPSS rescore
  11. 2026-06-28 14:04 UTCEPSS rescore
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  23. 2026-06-19 19:23 UTCEPSS rescore
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  31. 2026-06-13 22:57 UTCEPSS rescore
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  33. 2026-06-12 23:09 UTCEPSS rescore
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  35. 2026-06-12 21:10 UTCOSV refresh
  36. 2026-06-11 13:57 UTCEPSS rescore
  37. 2026-06-10 22:15 UTCEPSS rescore
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  51. 2026-05-31 22:28 UTCEPSS rescore
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  54. 2026-05-29 13:41 UTCEPSS rescore
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  57. 2026-05-27 13:38 UTCEPSS rescore
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  59. 2026-05-26 13:42 UTCEPSS rescore
  60. 2026-05-26 10:18 UTCEG score recompute
  61. 2026-05-26 10:18 UTCVendor advisory
  62. 2026-05-26 10:18 UTCGHSA enrichment
  63. 2026-05-26 07:16 UTCEPSS rescore
  64. 2026-05-25 13:46 UTCOSV refresh
  65. 2026-05-24 16:43 UTCEPSS rescore

Frequently asked(5)

What is CVE-2016-20012?
CVE-2016-20012 is a medium vulnerability published on September 15, 2021. OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE:…
When was CVE-2016-20012 disclosed?
CVE-2016-20012 was first published in the National Vulnerability Database on September 15, 2021, with the most recent update on May 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-20012 actively exploited?
CVE-2016-20012 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-20012?
CVE-2016-20012 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2016-20012?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-20012, 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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