CVE-2021-41991 : faille élevée strongswan strongswan (CVSS 7.5)

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.

Sévérité

Élevée (CVSS 7.5)

Vecteur CVSS

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

Exploitation active

Non signalée par la CISA

Publication

18 oct. 2021

Dernière mise à jour

17 juin 2026

• strongswan strongswan
• debian debian linux
• fedoraproject fedora
• siemens sinema remote connect server
• siemens siplus et 200sp cp 1542sp-1 irc tx rail firmware
• siemens simatic cp 1243-1 firmware
• siemens simatic cp 1242-7 gprs v2 firmware
• siemens simatic net cp 1243-8 irc firmware
• siemens scalance sc632-2c firmware
• siemens siplus et 200sp cp 1543sp-1 isec firmware
• siemens cp 1543-1 firmware
• siemens simatic net cp 1545-1 firmware
• siemens simatic cp 1543sp-1 firmware
• siemens simatic net cp1243-7 lte eu firmware
• siemens simatic cp 1243-7 lte\/us firmware
• siemens simatic cp 1542sp-1 firmware
• siemens scalance sc636-2c firmware
• siemens simatic cp 1542sp-1 irc firmware
• siemens scalance sc642-2c firmware
• siemens scalance sc646-2c firmware

• Fiche CVE-2021-41991 sur le NVD (NIST)
• cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf
• github.com/strongswan/strongswan/releases/tag/5.9.4
• lists.debian.org/debian-lts-announce/2021/10/msg00014.html
• lists.fedoraproject.org/archives/list/package…
• lists.fedoraproject.org/archives/list/package…
• lists.fedoraproject.org/archives/list/package…
• debian.org/security/2021/dsa-4989
• strongswan.org/blog/2021/10/18/strongswan…