CVE-2021-43527
NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER-encoded DSA or RSA-PSS signatures. Applications using NSS for handling
02 Description
NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER-encoded DSA or RSA-PSS signatures. Applications using NSS for handling
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 17.56% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 96.8% of scored records. A rank, not a probability.
- NVD base score
- 9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Critical. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-12-08 00:00Z4 YR AGO
- Last updated
- 2024-08-04 03:55Z2 YR AGO
- Reserved
- 2021-11-08
- Assigning CNA
- mozilla
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- Data version
- 5.1
- Document digest
- 72bc50c53a59baf381369a768d20f4bafbe2f7186c0d509b41620628885d3032
05 Affected products
06 References
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2021-51/
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1737470
- ftp.mozilla.orghttps://ftp.mozilla.org/pub/security/nss/releases/NSS_3_73_RTM/
- ftp.mozilla.orghttps://ftp.mozilla.org/pub/security/nss/releases/NSS_3_68_1_RTM/
- www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.html
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20211229-0002/
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdf
- www.starwindsoftware.comhttps://www.starwindsoftware.com/security/sw-20220802-0001/
- security.gentoo.orgGLSA-202212-05https://security.gentoo.org/glsa/202212-05
07 Fixed in
AlmaLinux 8
- nss Fixed in 3.67.0-7.el8_5
- nss-devel Fixed in 3.67.0-7.el8_5
- nss-softokn Fixed in 3.67.0-7.el8_5
- nss-softokn-devel Fixed in 3.67.0-7.el8_5
- nss-softokn-freebl Fixed in 3.67.0-7.el8_5
- nss-softokn-freebl-devel Fixed in 3.67.0-7.el8_5
- nss-sysinit Fixed in 3.67.0-7.el8_5
- nss-tools Fixed in 3.67.0-7.el8_5
- nss-util Fixed in 3.67.0-7.el8_5
- nss-util-devel Fixed in 3.67.0-7.el8_5
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- lib32-nss Fixed in 3.73-1
- nss Fixed in 3.73-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- nss Fixed in 3.67.0-7.el8_5
- nss-devel Fixed in 3.67.0-7.el8_5
- nss-softokn Fixed in 3.67.0-7.el8_5
- nss-softokn-devel Fixed in 3.67.0-7.el8_5
- nss-softokn-freebl Fixed in 3.67.0-7.el8_5
- nss-softokn-freebl-devel Fixed in 3.67.0-7.el8_5
- nss-sysinit Fixed in 3.67.0-7.el8_5
- nss-tools Fixed in 3.67.0-7.el8_5
- nss-util Fixed in 3.67.0-7.el8_5
- nss-util-devel Fixed in 3.67.0-7.el8_5
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- nss Fixed in 2:3.73-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- nss Fixed in 2:3.73-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- nss Fixed in 2:3.73-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- nss Fixed in 2:3.35-2ubuntu2.13
- thunderbird Fixed in 1:78.14.0+build1-0ubuntu0.18.04.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- nss Fixed in 2:3.49.1-1ubuntu1.6
- thunderbird Fixed in 1:78.14.0+build1-0ubuntu0.20.04.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- nss Fixed in 2:3.68-1ubuntu2
- thunderbird Fixed in 1:91.4.0+build1.1-0ubuntu1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- nss Fixed in 2:3.28.4-0ubuntu0.14.04.5+esm10Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- nss Fixed in 2:3.28.4-0ubuntu0.16.04.14+esm2Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.