CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2021-41991
High (7.5). EPSS 5.3% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 5.3% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)
- CWE
- CWE-190
- Published
- Modified
- Record from
- the NVD, synced
Affected
- debian:debian_linux
- fedoraproject:fedora
- siemens:cp_1543-1_firmware
- siemens:scalance_sc622-2c_firmware
- siemens:scalance_sc632-2c_firmware
- siemens:scalance_sc636-2c_firmware
- siemens:scalance_sc642-2c_firmware
- siemens:scalance_sc646-2c_firmware
- siemens:simatic_cp_1242-7_gprs_v2_firmware
- siemens:simatic_cp_1243-1_firmware
- siemens:simatic_cp_1243-7_lte\/us_firmware
- siemens:simatic_cp_1542sp-1_firmware
- siemens:simatic_cp_1542sp-1_irc_firmware
- siemens:simatic_cp_1543sp-1_firmware
- siemens:simatic_net_cp1243-7_lte_eu_firmware
- siemens:simatic_net_cp_1243-8_irc_firmware
- siemens:simatic_net_cp_1545-1_firmware
- siemens:sinema_remote_connect_server
- siemens:siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware
- siemens:siplus_et_200sp_cp_1543sp-1_isec_firmware
- siemens:siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware
- siemens:siplus_net_cp_1543-1_firmware
- siemens:siplus_s7-1200_cp_1243-1_firmware
- siemens:siplus_s7-1200_cp_1243-1_rail_firmware
- strongswan:strongswan
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://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/