Vulnerability Details : CVE-2021-43537

An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

Published 2021-12-08 22:15:10

Updated 2022-12-09 15:19:18

Source Mozilla Corporation

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-43537

Probability of exploitation activity in the next 30 days: 0.41%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 70 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-43537

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
6.8	MEDIUM	AV:N/AC:M/Au:N/C:P/I:P/A:P	8.6	6.4	nvd@nist.gov
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	2.8	5.9	nvd@nist.gov
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-43537

CWE-704 Incorrect Type Conversion or Cast

The product does not correctly convert an object, resource, or structure from one type to a different type.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-43537

https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html

[SECURITY] [DLA 2874-1] thunderbird security update
Mailing List;Third Party Advisory

CVEs referencing this url
https://bugzilla.mozilla.org/show_bug.cgi?id=1738237

Access Denied
Issue Tracking;Permissions Required;Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html

[SECURITY] [DLA 2863-1] firefox-esr security update
Mailing List;Third Party Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2021-53/

Security Vulnerabilities fixed in Firefox ESR 91.4.0 — Mozilla
Vendor Advisory

CVEs referencing this url
https://www.debian.org/security/2021/dsa-5026

Debian -- Security Information -- DSA-5026-1 firefox-esr
Third Party Advisory

CVEs referencing this url
https://security.gentoo.org/glsa/202202-03

Mozilla Firefox: Multiple vulnerabilities (GLSA 202202-03) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://www.debian.org/security/2022/dsa-5034

Debian -- Security Information -- DSA-5034-1 thunderbird
Third Party Advisory

CVEs referencing this url
https://security.gentoo.org/glsa/202208-14

Mozilla Thunderbird: Multiple Vulnerabilities (GLSA 202208-14) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2021-54/

Security Vulnerabilities fixed in Thunderbird 91.4.0 — Mozilla
Vendor Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2021-52/

Security Vulnerabilities fixed in Firefox 95 — Mozilla
Vendor Advisory

CVEs referencing this url

Products affected by CVE-2021-43537

Debian » Debian Linux » Version: 9.0
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Matching versions
Debian » Debian Linux » Version: 10.0
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Matching versions
Debian » Debian Linux » Version: 11.0
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Matching versions
Mozilla » Firefox
Versions before (<) 95.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Matching versions
Mozilla » Thunderbird
Versions before (<) 91.4.0
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Matching versions
Mozilla » Firefox Esr
Versions before (<) 91.4.0
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Matching versions