🛡️ CVE-2023-4056 — debian-linux

🔴 CVSS 9.8 — Critical ✅ No Known Exploit CWE-787 NVD

9.8

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Memory safety bugs present in Firefox 115, Firefox ESR 115.0, Firefox ESR 102.13, Thunderbird 115.0, and Thunderbird 102.13. 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 < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2023-4056 is classified as CWE-787: Out-of-bounds Write. Data is written past the end or before the start of a buffer, corrupting whatever is stored there.

Affected software

CVE-2023-4056 is recorded against 2 packages.

debian-linux
firefox (from 115.0 up to 115.1)

Timeline and source

Published on 1 August 2023 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

bugzilla.mozilla.org
lists.debian.org
lists.debian.org
www.debian.org
www.debian.org
www.mozilla.org
www.mozilla.org
www.mozilla.org
bugzilla.mozilla.org
lists.debian.org
lists.debian.org
www.debian.org
www.debian.org
www.mozilla.org
www.mozilla.org

CVE-2023-4056 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian Ubuntu

Details

Severity CRITICAL

CVSS Score 9.8

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE CWE-787

Public Exploit ✅ No

Source NVD

Published 2023-08-01

Updated 2026-08-11

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
debian-linux	—	—
firefox	115.0	115.1

References

Broken Link, Issue Tracking https://bugzilla.mozilla.org/buglist.cgi?bug_id=1820587%2C1824634%2C1839235%2C1842325%2C1843847

Mailing List, Third Party Advisory https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html

Mailing List, Third Party Advisory https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html

Mailing List, Third Party Advisory https://www.debian.org/security/2023/dsa-5464

Mailing List, Third Party Advisory https://www.debian.org/security/2023/dsa-5469

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-29/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-30/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-31/

Broken Link, Issue Tracking https://bugzilla.mozilla.org/buglist.cgi?bug_id=1820587%2C1824634%2C1839235%2C1842325%2C1843847

Mailing List, Third Party Advisory https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html

Mailing List, Third Party Advisory https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html

Mailing List, Third Party Advisory https://www.debian.org/security/2023/dsa-5464

Mailing List, Third Party Advisory https://www.debian.org/security/2023/dsa-5469

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-29/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-30/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2023-31/

🔗 NVD 🔗 Mitre

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