CVE-2021-45960
expat: In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) placesin the storeAtts function in xmlparse.c can...
CVE-2021-45960 is fixed in 9 products on 1 platform, first by DEBIAN-CVE-2021-45960, released January 1, 2022. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
9.8
Low
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0467
91st percentile
In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) placesin the storeAtts function in xmlparse.c can lead to realloc misbehavior(e.g., allocating too few bytes, or only freeing memory).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| expat · Debian 11.6 (bullseye) | 2.2.10-2+deb11u1 | DSA-5073-1 | Feb 12, 2022 |
| expat · Debian 12.15 (bookworm) | 2.4.3-1 | DEBIAN-CVE-2021-45960 | Jan 1, 2022 |
| expat · Debian 13.5 (trixie) | 2.4.3-1 | DEBIAN-CVE-2021-45960 | Jan 1, 2022 |
| expat · Debian 14 | 2.4.3-1 | DEBIAN-CVE-2021-45960 | Jan 1, 2022 |
| expat · RHEL 8 | 0:2.2.5-4.el8_5.3 | RHSA-2022:0951 | Mar 16, 2022 |
| expat · Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.4 | expat 2.2.5-3ubuntu0.4 | Feb 14, 2022 |
| expat · Ubuntu 20.04 LTS (focal) | 2.2.9-1ubuntu0.2 | expat 2.2.9-1ubuntu0.2 | Feb 14, 2022 |
| expat · Ubuntu 22.04.1 LTS (jammy) | 2.4.3-1 | expat 2.4.3-1 | Jan 10, 2022 |
| expat · Ubuntu 24.10 (oracular) | 2.4.3-1 | expat 2.4.3-1 | Jan 16, 2026 |
| expat · Ubuntu 25.04 (plucky) | 2.4.3-1 | expat 2.4.3-1 | Jan 16, 2026 |
| expat · almalinux 8 | 2.2.5-8.el8_6.2 | ALSA-2022:0951 | Mar 16, 2022 |
| expat · amzn 2023 | 2.5.0-1.amzn2023.0.2 | ALAS2023-2023-058 | Feb 17, 2023 |
| expat · ol 8 | 0:2.2.5-4.el8_5.3 | ELSA-2022-0951 | Mar 16, 2022 |
| expat · rocky 8 | 0:2.2.5-4.el8_5.3 | RLSA-2022:0951 | Mar 16, 2022 |
| expat-debuginfo · amzn 2023 | 2.5.0-1.amzn2023.0.2 | ALAS2023-2023-058 | Feb 17, 2023 |
| expat-debugsource · amzn 2023 | 2.5.0-1.amzn2023.0.2 | ALAS2023-2023-058 | Feb 17, 2023 |
| expat-devel · RHEL 8 | 0:2.2.5-4.el8_5.3 | RHSA-2022:0951 | Mar 16, 2022 |
| expat-devel · almalinux 8 | 2.2.5-8.el8_6.2 | ALSA-2022:0951 | Mar 16, 2022 |
| expat-devel · amzn 2023 | 2.5.0-1.amzn2023.0.2 | ALAS2023-2023-058 | Feb 17, 2023 |
| expat-devel · ol 8 | 0:2.2.5-4.el8_5.3 | ELSA-2022-0951 | Mar 16, 2022 |
| expat-static · amzn 2023 | 2.5.0-1.amzn2023.0.2 | ALAS2023-2023-058 | Feb 17, 2023 |
| firefox · Ubuntu 18.04.6 LTS (bionic) | 98.0+build3-0ubuntu0.18.04.2 | firefox 98.0+build3-0ubuntu0.18.04.2 | Mar 8, 2022 |
| firefox · Ubuntu 20.04 LTS (focal) | 98.0+build3-0ubuntu0.20.04.2 | firefox 98.0+build3-0ubuntu0.20.04.2 | Mar 8, 2022 |
| firefox · Ubuntu 22.04.1 LTS (jammy) | 1:1snap1-0ubuntu1 | firefox 1:1snap1-0ubuntu1 | Apr 6, 2022 |
| firefox · Ubuntu 24.10 (oracular) | 1:1snap1-0ubuntu1 | firefox 1:1snap1-0ubuntu1 | Feb 15, 2022 |
| firefox · Ubuntu 25.04 (plucky) | 1:1snap1-0ubuntu1 | firefox 1:1snap1-0ubuntu1 | Feb 15, 2022 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 98.0+build3-0ubuntu0.18.04.2 | firefox-geckodriver 98.0+build3-0ubuntu0.18.04.2 | Mar 8, 2022 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 98.0+build3-0ubuntu0.20.04.2 | firefox-geckodriver 98.0+build3-0ubuntu0.20.04.2 | Mar 8, 2022 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 98.0+build3-0ubuntu0.18.04.2 | firefox-mozsymbols 98.0+build3-0ubuntu0.18.04.2 | Mar 8, 2022 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 98.0+build3-0ubuntu0.20.04.2 | firefox-mozsymbols 98.0+build3-0ubuntu0.20.04.2 | Mar 8, 2022 |
| libexpat1 · Ubuntu 18.04.6 LTS (bionic) | 2.2.5-3ubuntu0.4 | libexpat1 2.2.5-3ubuntu0.4 | Feb 14, 2022 |
| libexpat1 · Ubuntu 20.04 LTS (focal) | 2.2.9-1ubuntu0.2 | libexpat1 2.2.9-1ubuntu0.2 | Feb 14, 2022 |
| libexpat1 · Ubuntu 22.04.1 LTS (jammy) | 2.4.3-1 | libexpat1 2.4.3-1 | Jan 10, 2022 |
| libexpat1 · Ubuntu 24.10 (oracular) | 2.4.3-1 | libexpat1 2.4.3-1 | Jan 16, 2026 |
| libexpat1 · Ubuntu 25.04 (plucky) | 2.4.3-1 | libexpat1 2.4.3-1 | Jan 16, 2026 |
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