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CVE-2025-2817

Privilege escalation in Thunderbird Updater

HIGH
8.8
CVSS Score
Published: April 29, 2025 at 01:13 PM UTC
Updated: October 5, 2026 at 03:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
HIGH8.8
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

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 affects Firefox < 138, Firefox ESR < 128.10, Firefox ESR < 115.23, Thunderbird < 138, and Thunderbird < 128.10.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 115.23.0v < 138.0116.0 ≤ v < 128.10.0
Vendor states this is fixed in 115.23 (unaffected)
Affected range stops below 115.23.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 128.10 (unaffected)
Affected range stops below 128.10.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 138 (unaffected)
Affected range stops below 138.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 128.10.0129.0 ≤ v < 138.0
Vendor states this is fixed in 128.10 (unaffected)
Affected range stops below 128.10.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 138 (unaffected)
Affected range stops below 138.0, so it looks safe — our inference, not a vendor statement

References (7)

Permissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1917536
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-28/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-29/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-30/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-31/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-32/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-22

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