CVE-2017-5399

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
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

Memory safety bugs were reported in Firefox 51. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 52 and Thunderbird < 52.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
81.0%
KEV
Not listed

Published

June 11, 2018

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Jun 28, 2026
No patch confirmed yet.
generic

Security vulnerabilities fixed in - Thunderbird 52 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2017-09/
generic

Security vulnerabilities fixed in Firefox 52 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2017-05/
generic

Client Challenge

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1332569%2C1315248%2C1261335%2C1321038%2C1331771%2C1339566%2C1339591%2C1240893%2C1341905%2C1323241%2C1336467%2C1270288%2C1295299%2C1296024%2C1304201%2C1306142%2C1307557%2C1308036%2C1334246%2C1334290%2C1317085%2C1339116%2C1324000%2C1323150%2C1332501%2C1320894%2C1333752%2C1303713%2C1321566%2C1264053%2C1343513
generic
http://www.securitytracker.com/id/1037966
generic
http://www.securityfocus.com/bid/96692

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Frequently asked(5)

What is CVE-2017-5399?
CVE-2017-5399 is a critical vulnerability published on June 11, 2018. Memory safety bugs were reported in Firefox 51. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 52 and Thunderbird < 52.
When was CVE-2017-5399 disclosed?
CVE-2017-5399 was first published in the National Vulnerability Database on June 11, 2018, 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-2017-5399 actively exploited?
CVE-2017-5399 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 81.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-5399?
CVE-2017-5399 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-5399?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-5399, 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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