CVE-2021-41991

high
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

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://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html

https://github.com/strongswan/strongswan/releases/tag/5.9.4

https://www.debian.org/security/2021/dsa-4989

https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html

https://lists.fedoraproject.org/archives/list/[email protected]/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/

https://lists.fedoraproject.org/archives/list/[email protected]/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/

https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/

Details

Source: MITRE

Published: 2021-10-18

Updated: 2021-11-26

Type: CWE-190

Risk Information

CVSS v2

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3

Base Score: 7.5

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

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH

Tenable Plugins

View all (8 total)

IDNameProductFamilySeverity
154770openSUSE 15 Security Update : strongswan (openSUSE-SU-2021:1399-1)NessusSuSE Local Security Checks
high
154257Debian DLA-2788-1 : strongswan - LTS security updateNessusDebian Local Security Checks
critical
154250SUSE SLES11 Security Update : strongswan (SUSE-SU-2021:14827-1)NessusSuSE Local Security Checks
critical
154249SUSE SLED15 / SLES15 Security Update : strongswan (SUSE-SU-2021:3467-1)NessusSuSE Local Security Checks
critical
154248SUSE SLES15 Security Update : strongswan (SUSE-SU-2021:3469-1)NessusSuSE Local Security Checks
critical
154247SUSE SLES12 Security Update : strongswan (SUSE-SU-2021:3468-1)NessusSuSE Local Security Checks
critical
154243openSUSE 15 Security Update : strongswan (openSUSE-SU-2021:3467-1)NessusSuSE Local Security Checks
critical
154229Debian DSA-4989-1 : strongswan - security updateNessusDebian Local Security Checks
critical