CVE-2025-2817

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2025-04-29. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

April 29, 2025

Last Modified

April 13, 2026

Advisory Details (7)

Auto-updated May 21, 2026
⚠️ Active exploitation confirmed. Patch available.
generic Patch Available

[SECURITY] [DLA 4167-1] thunderbird security update

https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html
generic

Security Vulnerabilities fixed in Thunderbird 128.10 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-32/
generic

Security Vulnerabilities fixed in Thunderbird 138 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-31/
generic

Security Vulnerabilities fixed in Firefox ESR 115.23 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-30/
generic

Security Vulnerabilities fixed in Firefox ESR 128.10 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-29/
generic

Security Vulnerabilities fixed in Firefox 138 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-28/
generic🔴 Active Exploitation

1917536 - (CVE-2025-2817) Firefox Updater Elevation of Privilege to SYSTEM

https://bugzilla.mozilla.org/show_bug.cgi?id=1917536

Patch Availability(22)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatthunderbird-0:128.10.0-1.el8_82025-05-15redhat
redhatthunderbird-0:128.10.0-1.el8_22025-05-15redhat
redhatthunderbird-0:128.10.0-1.el9_42025-05-15redhat
redhatthunderbird-0:128.10.0-1.el8_62025-05-15redhat
redhatthunderbird-0:128.10.0-1.el9_02025-05-15redhat
redhatthunderbird-0:128.10.0-1.el8_42025-05-15redhat
redhatthunderbird-0:128.10.0-1.el9_22025-05-15redhat
redhatfirefox-0:128.10.0-1.el8_62025-05-14redhat
redhatfirefox-0:128.10.0-1.el8_42025-05-14redhat
redhatfirefox-0:128.10.0-1.el8_82025-05-14redhat
redhatfirefox-0:128.10.0-1.el8_22025-05-14redhat
redhatfirefox-0:128.10.0-1.el9_62025-05-13redhat
redhatfirefox-0:128.10.0-1.el10_02025-05-13redhat
redhatthunderbird-0:128.10.0-1.el10_02025-05-13redhat
redhatthunderbird-0:128.10.0-1.el8_102025-05-12redhat
redhatfirefox-0:128.10.0-1.el9_42025-05-08redhat
redhatfirefox-0:128.10.0-1.el9_02025-05-08redhat
redhatfirefox-0:128.10.0-1.el9_22025-05-08redhat
redhatfirefox-0:128.10.0-1.el7_92025-05-08redhat
redhatfirefox-0:128.10.0-1.el9_52025-05-05redhat
redhatfirefox-0:128.10.0-1.el8_102025-05-05redhat
redhatthunderbird-0:128.10.0-1.el9_52025-05-05redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

All Vendor Advisories

(22)

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 7× in last 7d / 40× 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 139 total refreshes for this CVE.

  1. 2026-08-07 16:26 UTCEPSS rescore
  2. 2026-08-06 13:46 UTCEPSS rescore
  3. 2026-08-05 19:16 UTCEPSS rescore
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  73. 2026-06-01 13:51 UTCEPSS rescore
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  75. 2026-05-31 22:30 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-2817?
CVE-2025-2817 is a high vulnerability published on April 29, 2025. Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations…
When was CVE-2025-2817 disclosed?
CVE-2025-2817 was first published in the National Vulnerability Database on April 29, 2025, with the most recent update on April 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-2817 actively exploited?
CVE-2025-2817 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.2% of all scored CVEs.
What is the CVSS score of CVE-2025-2817?
CVE-2025-2817 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2025-2817?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-2817, 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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