CVE-2021-41991
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-41991
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41991.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-41991
- Downstream
- Related
- Published
- 2021-10-18T14:15:10Z
- Modified
- 2025-10-21T06:36:33.062561Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.
- References
-
- https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf
- https://github.com/strongswan/strongswan/releases/tag/5.9.4
- https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html
- https://www.debian.org/security/2021/dsa-4989
- https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/
Affected packages
Git / github.com/strongswan/strongswan
Affected ranges
- Type
- GIT
- Repo
- https://github.com/strongswan/strongswan
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
Affected versions
4.*
4.0.0
4.0.1
4.0.2
4.0.3
4.0.4
4.0.5
4.0.6
4.0.7
4.1.0
4.1.1
4.1.10
4.1.11
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
4.1.9
4.2.0
4.2.1
4.2.10
4.2.11
4.2.12
4.2.13
4.2.14
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
4.3.0
4.3.1
4.3.2
4.3.3
4.3.4
4.3.5
4.3.5rc1
4.3.6
4.4.0
4.4.1
4.5.0
4.5.1
4.5.2
4.5.3
4.6.0
4.6.1
4.6.2
4.6.3
5.*
5.0.0
5.0.1
5.0.2
5.0.2dr4
5.0.2rc1
5.0.3
5.0.3dr1
5.0.3dr2
5.0.3dr3
5.0.3rc1
5.0.4
5.1.0
5.1.0dr1
5.1.0dr2
5.1.0rc1
5.1.1
5.1.1dr1
5.1.1dr2
5.1.1dr3
5.1.1dr4
5.1.1rc1
5.1.2
5.1.2.dr2
5.1.2dr1
5.1.2dr3
5.1.2rc1
5.1.2rc2
5.1.3
5.1.3dr1
5.1.3rc1
5.2.0
5.2.0dr1
5.2.0dr2
5.2.0dr3
5.2.0dr4
5.2.0dr5
5.2.0dr6
5.2.0rc1
5.2.1
5.2.1dr1
5.2.1rc1
5.2.2
5.2.2dr1
5.2.2rc1
5.3.0
5.3.0dr1
5.3.0rc1
5.3.1
5.3.1dr1
5.3.1rc1
5.3.2
5.3.3
5.3.3dr1
5.3.3dr3
5.3.3dr4
5.3.3dr5
5.3.3dr6
5.3.3rc2
5.3.4
5.3.4dr1
5.3.4dr2
5.3.4dr3
5.3.4rc1
5.3.5
5.4.0
5.4.0dr1
5.4.0dr2
5.4.0dr3
5.4.0dr4
5.4.0dr5
5.4.0dr6
5.4.0dr7
5.4.0dr8
5.4.0rc1
5.4.1dr1
5.4.1dr2
5.4.1dr3
5.4.1dr4
5.5.0
5.5.0dr1
5.5.0rc1
5.5.1
5.5.1dr1
5.5.1dr2
5.5.1dr3
5.5.1dr4
5.5.1dr5
5.5.1rc1
5.5.1rc2
5.5.2
5.5.2dr1
5.5.2dr2
5.5.2dr3
5.5.2dr4
5.5.2dr5
5.5.2dr6
5.5.2dr7
5.5.2rc1
5.5.3
5.5.3dr1
5.5.3dr2
5.6.0
5.6.0dr1
5.6.0dr2
5.6.0dr3
5.6.0dr4
5.6.0rc1
5.6.0rc2
5.6.1
5.6.1dr1
5.6.1dr2
5.6.1dr3
5.6.1rc1
5.6.2
5.6.2dr1
5.6.2dr2
5.6.2dr3
5.6.2dr4
5.6.2rc1
5.6.3
5.6.3dr1
5.6.3dr2
5.6.3rc1
5.7.0
5.7.0dr1
5.7.0dr2
5.7.0dr3
5.7.0dr4
5.7.0dr5
5.7.0dr6
5.7.0dr8
5.7.0rc1
5.7.0rc2
5.7.1
5.7.2
5.7.2dr1
5.7.2dr2
5.7.2dr3
5.7.2dr4
5.7.2rc1
5.8.0
5.8.0dr2
5.8.0rc1
5.8.1
5.8.1dr1
5.8.1rc2
5.8.2
5.8.2dr1
5.8.2dr2
5.8.2rc1
5.8.2rc2
5.8.3
5.8.3rc1
5.8.4
5.9.0
5.9.0dr1
5.9.0dr2
5.9.0rc1
5.9.1
5.9.1dr1
5.9.1rc1
5.9.2
5.9.2dr1
5.9.2dr2
5.9.2rc1
5.9.2rc2
5.9.3
5.9.3dr1
5.9.3dr2
5.9.3dr3
5.9.3dr4
5.9.3rc1
5.9.4dr1
5.9.4dr2
5.9.4dr3
5.9.4rc1
android-2.*
android-2.3.3
android-2.3.3-1