CVE-2025-6425
published 2025-06-24CVE-2025-6425: An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between…
PriorityP419medium4.3CVSS 3.1
AVNACLPRNUIRSUCLINAN
EPSS
0.25%
16.2th percentile
An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 140.0-1 (sid) | firefox 140.0-1 (sid) |
| debian | firefox-esr | < firefox 140.0-1 (sid) | firefox 140.0-1 (sid) |
| debian | thunderbird | < firefox 140.0-1 (sid) | firefox 140.0-1 (sid) |
| mozilla | firefox | < 115.25.0 | 115.25.0 |
| mozilla | firefox | < 140.0 | 140.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 116.0 < 128.12.0 | 128.12.0 |
| mozilla | thunderbird | >= 0 < 1:128.12.0esr-1~deb11u1 | 1:128.12.0esr-1~deb11u1 |
| mozilla | thunderbird | >= 0 < 1:128.12.0esr-1~deb12u1 | 1:128.12.0esr-1~deb12u1 |
| mozilla | thunderbird | >= 0 < 1:128.12.0esr-1 | 1:128.12.0esr-1 |
| mozilla | thunderbird | >= 0 < 1:128.12.0esr-1 | 1:128.12.0esr-1 |
CVSS provenance
nvdv3.14.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
osv4.3MEDIUM
vendor_debian4.3MEDIUM
vendor_redhat4.3MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Ubuntu
Thunderbird vulnerabilities
vendor_ubuntu·2025-07-22
CVE-2025-4083 Thunderbird vulnerabilities
Title: Thunderbird vulnerabilities
Summary: Several security issues were fixed in Thunderbird.
Multiple security issues were discovered in Thunderbird. If a user were
tricked into opening a specially crafted website in a browsing context, an
attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, bypass security restrictions, cross-site
tracing, or execute arbitrary code.
Instructions: This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart thunderbird to
make all the necessary changes.
Red Hat
firefox: thunderbird: The WebCompat WebExtension shipped with Firefox exposed a persistent UUID
vendor_redhat·2025-06-24·CVSS 4.3
CVE-2025-6425 [MEDIUM] CWE-200 firefox: thunderbird: The WebCompat WebExtension shipped with Firefox exposed a persistent UUID
firefox: thunderbird: The WebCompat WebExtension shipped with Firefox exposed a persistent UUID
An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability affects Firefox < 140, Firefox ESR < 115.25, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser and persisted between containers and normal/private browsing mode but not profiles.
Statement: Red Ha
Debian
CVE-2025-6425: firefox - An attacker who enumerated resources from the WebCompat extension could have obt...
vendor_debian·2025·CVSS 4.3
CVE-2025-6425 [MEDIUM] CVE-2025-6425: firefox - An attacker who enumerated resources from the WebCompat extension could have obt...
An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability affects Firefox < 140, Firefox ESR < 115.25, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.
Scope: local
sid: resolved (fixed in 140.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-51: CVE-2025-6425
vendor_mozilla·CVSS 4.3
CVE-2025-6425 [MEDIUM] Mozilla Foundation Security Advisory 2025-51: CVE-2025-6425
Mozilla Foundation Security Advisory 2025-51
CVE: CVE-2025-6425
Product: Firefox
Impact: high
Fixed in: Firefox 140
Mozilla
Mozilla Foundation Security Advisory 2025-52: CVE-2025-6425
vendor_mozilla·CVSS 4.3
CVE-2025-6425 [MEDIUM] Mozilla Foundation Security Advisory 2025-52: CVE-2025-6425
Mozilla Foundation Security Advisory 2025-52
CVE: CVE-2025-6425
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 115.25
Mozilla
Mozilla Foundation Security Advisory 2025-54: CVE-2025-6425
vendor_mozilla·CVSS 4.3
CVE-2025-6425 [MEDIUM] Mozilla Foundation Security Advisory 2025-54: CVE-2025-6425
Mozilla Foundation Security Advisory 2025-54
CVE: CVE-2025-6425
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140
Mozilla
Mozilla Foundation Security Advisory 2025-55: CVE-2025-6425
vendor_mozilla·CVSS 4.3
CVE-2025-6425 [MEDIUM] Mozilla Foundation Security Advisory 2025-55: CVE-2025-6425
Mozilla Foundation Security Advisory 2025-55
CVE: CVE-2025-6425
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 128.12
Mozilla
Mozilla Foundation Security Advisory 2025-53: CVE-2025-6425
vendor_mozilla·CVSS 4.3
CVE-2025-6425 [MEDIUM] Mozilla Foundation Security Advisory 2025-53: CVE-2025-6425
Mozilla Foundation Security Advisory 2025-53
CVE: CVE-2025-6425
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 128.12
GHSA
GHSA-2h3c-qrcw-962q: An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted bet
ghsa_unreviewed·2025-06-26
CVE-2025-6425 [MEDIUM] CWE-200 GHSA-2h3c-qrcw-962q: An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted bet
An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability affects Firefox < 140, Firefox ESR < 115.25, and Firefox ESR < 128.12.
OSV
CVE-2025-6425: An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted bet
osv·2025-06-24·CVSS 4.3
CVE-2025-6425 [MEDIUM] CVE-2025-6425: An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted bet
An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability affects Firefox < 140, Firefox ESR < 115.25, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=1717672https://www.mozilla.org/security/advisories/mfsa2025-51/https://www.mozilla.org/security/advisories/mfsa2025-52/https://www.mozilla.org/security/advisories/mfsa2025-53/https://www.mozilla.org/security/advisories/mfsa2025-54/https://www.mozilla.org/security/advisories/mfsa2025-55/https://lists.debian.org/debian-lts-announce/2025/06/msg00029.htmlhttps://lists.debian.org/debian-lts-announce/2025/07/msg00002.html
2025-06-24
Published