CVE-2018-20817

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 4%CVSS: 9.8Exploit: NoneExposed: 0

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

SV_SteamAuthClient in various Activision Infinity Ward Call of Duty games before 2015-08-11 is missing a size check when reading authBlob data into a buffer, which allows one to execute code on the remote target machine when sending a steam authentication request. This affects Call of Duty: Modern Warfare 2, Call of Duty: Modern Warfare 3, Call of Duty: Ghosts, Call of Duty: Advanced Warfare, Call of Duty: Black Ops 1, and Call of Duty: Black Ops 2.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
88.1%
KEV
Not listed

Published

April 19, 2019

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jun 18, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

cod-exploits/steam-auth at master · momo5502/cod-exploits · GitHub

https://github.com/momo5502/cod-exploits/tree/master/steam-auth
generic🟡 PoC Available

GitHub - RektInator/cod-steamauth-rce · GitHub

https://github.com/RektInator/cod-steamauth-rce

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 48× 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. 2026-07-06 16:24 UTCEPSS rescore
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  39. 2026-05-27 20:26 UTCEG score recompute
  40. 2026-05-27 20:26 UTCGHSA enrichment
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  43. 2026-05-26 07:17 UTCEPSS rescore
  44. 2026-05-26 07:17 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2018-20817?
CVE-2018-20817 is a critical vulnerability published on April 19, 2019. SV_SteamAuthClient in various Activision Infinity Ward Call of Duty games before 2015-08-11 is missing a size check when reading authBlob data into a buffer, which allows one to execute code on the remote target machine when sending a steam authentication request. This affects Call of Duty: Modern…
When was CVE-2018-20817 disclosed?
CVE-2018-20817 was first published in the National Vulnerability Database on April 19, 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-2018-20817 actively exploited?
CVE-2018-20817 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 88.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-20817?
CVE-2018-20817 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-20817?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20817, 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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