CVE-2025-5268
published 2025-05-27CVE-2025-5268: Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of memory corruption…
PriorityP346high8.1CVSS 3.1
AVNACHPRNUINSUCHIHAH
EPSS
0.41%
33.4th percentile
Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 139.0-1 (sid) | firefox 139.0-1 (sid) |
| debian | firefox-esr | < firefox 139.0-1 (sid) | firefox 139.0-1 (sid) |
| debian | thunderbird | < firefox 139.0-1 (sid) | firefox 139.0-1 (sid) |
| mozilla | firefox | < 128.11.0 | 128.11.0 |
| mozilla | firefox | < 139.0 | 139.0 |
| mozilla | firefox | — | — |
| mozilla | thunderbird | < 128.11.0 | 128.11.0 |
| mozilla | thunderbird | >= 0 < 1:128.11.0esr-1~deb11u1 | 1:128.11.0esr-1~deb11u1 |
| mozilla | thunderbird | >= 0 < 1:128.11.0esr-1~deb12u1 | 1:128.11.0esr-1~deb12u1 |
| mozilla | thunderbird | >= 0 < 1:128.11.0esr-1 | 1:128.11.0esr-1 |
| mozilla | thunderbird | >= 0 < 1:128.11.0esr-1 | 1:128.11.0esr-1 |
| mozilla | thunderbird | >= 129.0 < 139.0 | 139.0 |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
osv8.1HIGH
vendor_debian8.1HIGH
vendor_redhat8.1HIGH
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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: Memory safety bugs
vendor_redhat·2025-05-27·CVSS 8.1
CVE-2025-5268 [HIGH] CWE-119 firefox: thunderbird: Memory safety bugs
firefox: thunderbird: Memory safety bugs
Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 139, Firefox ESR < 128.11, Thunderbird < 139, and Thunderbird < 128.11.
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Some memory bugs show evidence of memory corruption, and we presume that with enough effort, some of these could be exploited to run arbitrary code.
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Packa
Debian
CVE-2025-5268: firefox - Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, ...
vendor_debian·2025·CVSS 8.1
CVE-2025-5268 [HIGH] CVE-2025-5268: firefox - Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, ...
Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 139, Firefox ESR < 128.11, Thunderbird < 139, and Thunderbird < 128.11.
Scope: local
sid: resolved (fixed in 139.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-46: CVE-2025-5268
vendor_mozilla·CVSS 8.1
CVE-2025-5268 [HIGH] Mozilla Foundation Security Advisory 2025-46: CVE-2025-5268
Mozilla Foundation Security Advisory 2025-46
CVE: CVE-2025-5268
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 128.11
Mozilla
Mozilla Foundation Security Advisory 2025-44: CVE-2025-5268
vendor_mozilla·CVSS 8.1
CVE-2025-5268 [HIGH] Mozilla Foundation Security Advisory 2025-44: CVE-2025-5268
Mozilla Foundation Security Advisory 2025-44
CVE: CVE-2025-5268
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 128.11
Mozilla
Mozilla Foundation Security Advisory 2025-45: CVE-2025-5268
vendor_mozilla·CVSS 8.1
CVE-2025-5268 [HIGH] Mozilla Foundation Security Advisory 2025-45: CVE-2025-5268
Mozilla Foundation Security Advisory 2025-45
CVE: CVE-2025-5268
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 139
Mozilla
Mozilla Foundation Security Advisory 2025-42: CVE-2025-5268
vendor_mozilla·CVSS 8.1
CVE-2025-5268 [HIGH] Mozilla Foundation Security Advisory 2025-42: CVE-2025-5268
Mozilla Foundation Security Advisory 2025-42
CVE: CVE-2025-5268
Product: Firefox
Impact: moderate
Fixed in: Firefox 139
GHSA
GHSA-m885-h2wc-h2w3: Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128
ghsa_unreviewed·2025-05-27
CVE-2025-5268 [MEDIUM] CWE-119 GHSA-m885-h2wc-h2w3: Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128
Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 139 and Firefox ESR < 128.11.
OSV
CVE-2025-5268: Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128
osv·2025-05-27·CVSS 8.1
CVE-2025-5268 [HIGH] CVE-2025-5268: Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128
Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 139, Firefox ESR < 128.11, Thunderbird < 139, and Thunderbird < 128.11.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1950136%2C1958121%2C1960499%2C1962634https://www.mozilla.org/security/advisories/mfsa2025-42/https://www.mozilla.org/security/advisories/mfsa2025-44/https://www.mozilla.org/security/advisories/mfsa2025-45/https://www.mozilla.org/security/advisories/mfsa2025-46/https://lists.debian.org/debian-lts-announce/2025/05/msg00043.htmlhttps://lists.debian.org/debian-lts-announce/2025/05/msg00046.html
2025-05-27
Published