Memory safety bugs were reported in Firefox 54, Firefox ESR 52.2, and Thunderbird 52.2. 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 Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
CVE-2017-7779
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: 3%CVSS: 9.8Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 9.8
- EG Score
- 9.8(medium)
- EPSS
- 84.1%
- KEV
- Not listed
Published
June 11, 2018
Last Modified
November 25, 2025
Advisory Details (10)
Auto-updated Jun 7, 2026Patch available. Sources: redhat.
generic
Security vulnerabilities fixed in Firefox ESR 52.3 — Mozilla
https://www.mozilla.org/security/advisories/mfsa2017-19/generic
Security vulnerabilities fixed in Firefox 55 — Mozilla
https://www.mozilla.org/security/advisories/mfsa2017-18/generic
[SECURITY] [DSA 3968-1] icedove/thunderbird security update
https://www.debian.org/security/2017/dsa-3968generic
[SECURITY] [DSA 3928-1] firefox-esr security update
https://www.debian.org/security/2017/dsa-3928generic
Mozilla Thunderbird: Multiple vulnerabilities (GLSA 201803-14) — Gentoo security
https://security.gentoo.org/glsa/201803-14redhat Patch Available
Affected: Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.
https://access.redhat.com/errata/RHSA-2017:2534redhat Patch Available
Affected: Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.
https://access.redhat.com/errata/RHSA-2017:2456Frequently asked(5)
What is CVE-2017-7779?
CVE-2017-7779 is a critical vulnerability published on June 11, 2018. Memory safety bugs were reported in Firefox 54, Firefox ESR 52.2, and Thunderbird 52.2. 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 Thunderbird < 52.3, Firefox…
When was CVE-2017-7779 disclosed?
CVE-2017-7779 was first published in the National Vulnerability Database on June 11, 2018, with the most recent update on November 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-7779 actively exploited?
CVE-2017-7779 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 84.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-7779?
CVE-2017-7779 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-7779?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-7779, 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.
Dependency Blast Radius
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