CVE-2017-18365

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictMitigate this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Metasploit, epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 21%CVSS: 9.8Exploit: Metasploit · epss top5pct · public exploitExposed services: Not assessed

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

The Management Console in GitHub Enterprise 2.8.x before 2.8.7 has a deserialization issue that allows unauthenticated remote attackers to execute arbitrary code. This occurs because the enterprise session secret is always the same, and can be found in the product's source code. By sending a crafted cookie signed with this secret, one can call Marshal.load with arbitrary data, which is a problem because the Marshal data format allows Ruby objects.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100CISA SSVC

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
Severity98% × 45%
Exploitation65% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
21%
EPSS %ILE
97th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

March 28, 2019

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Oct 7, 2026
⚠️ Active exploitation confirmed. No fix on record yet.
generic🔴 Active Exploitation

GitHub Enterprise - The best way to build and ship software

https://enterprise.github.com/releases/2.8.7/notes

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 19× 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 123 total refreshes for this CVE.

  1. 2026-10-09 20:02 UTCEPSS rescore
  2. 2026-10-08 16:36 UTCEPSS rescore
  3. 2026-10-07 23:41 UTCEPSS rescore
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  1. 2026-08-27 14:21 UTCEPSS rescore
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  22. 2026-07-23 14:15 UTCEPSS rescore
  23. 2026-07-23 01:28 UTCEG score recompute
  24. 2026-07-22 22:07 UTCEG score recompute
  25. 2026-07-22 14:04 UTCEPSS rescore
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  27. 2026-07-21 15:21 UTCEPSS rescore
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  50. 2026-06-29 14:03 UTCEPSS rescore
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  70. 2026-06-14 23:14 UTCEPSS rescore
  71. 2026-06-13 22:57 UTCEPSS rescore
  72. 2026-06-12 23:09 UTCEPSS rescore
  73. 2026-06-10 22:15 UTCEPSS rescore
  74. 2026-06-10 13:19 UTCEPSS rescore
  75. 2026-06-07 15:22 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/linux/http/github_enterprise_secret✓ verified
    First seen Mar 15, 2017

    Github Enterprise Default Session Secret And Deserialization Vulnerability

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2017-18365?
CVE-2017-18365 is a critical vulnerability published on March 28, 2019. The Management Console in GitHub Enterprise 2.8.x before 2.8.7 has a deserialization issue that allows unauthenticated remote attackers to execute arbitrary code. This occurs because the enterprise session secret is always the same, and can be found in the product's source code. By sending a…
When was CVE-2017-18365 disclosed?
CVE-2017-18365 was first published on March 28, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-18365 actively exploited?
CVE-2017-18365 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 21% probability of exploitation in the next 30 days (97th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-18365?
CVE-2017-18365 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-18365?
No fix for CVE-2017-18365 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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