CVE-2021-41991
high-risk
Published 2021-10-18
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.
Do I need to act?
~
2.5% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10
High
NETWORK
/ LOW complexity
Affected Products (20)
Strongswan
Siplus Et 200Sp Cp 1542Sp-1 Irc Tx Rail Firmware
Simatic Cp 1243-1 Firmware
Simatic Cp 1242-7 Gprs V2 Firmware
Simatic Net Cp 1243-8 Irc Firmware
Scalance Sc632-2C Firmware
Siplus Et 200Sp Cp 1543Sp-1 Isec Firmware
Simatic Net Cp 1545-1 Firmware
Simatic Cp 1543Sp-1 Firmware
Simatic Net Cp1243-7 Lte Eu Firmware
Simatic Cp 1243-7 Lte\/Us Firmware
Simatic Cp 1542Sp-1 Firmware
Affected Vendors
References (16)
Third Party Advisory
https://github.com/strongswan/strongswan/releases/tag/5.9.4
Third Party Advisory
https://www.debian.org/security/2021/dsa-4989
Third Party Advisory
https://github.com/strongswan/strongswan/releases/tag/5.9.4
Third Party Advisory
https://www.debian.org/security/2021/dsa-4989
54
/ 100
high-risk
Severity
26/34 · High
Exploitability
6/34 · Minimal
Exposure
22/34 · High