7.5
HIGH
CVE-2021-41991
StrongSwan Remote Integer Overflow Vulnerability
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.
INFO
Published Date :
Oct. 18, 2021, 2:15 p.m.
Last Modified :
Nov. 7, 2023, 3:39 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Affected Products
The following products are affected by CVE-2021-41991
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-41991.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-41991 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-41991 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference MITRE https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.html [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ [No types assigned] Removed Reference MITRE https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/ Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/ Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ -
Modified Analysis by [email protected]
Apr. 12, 2022
Action Type Old Value New Value Changed Reference Type https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf No Types Assigned https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf Patch, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:siemens:sinema_remote_connect_server:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:siplus_et_200sp_cp_1542sp-1_irc_tx_rail:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_1243-1_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp_1243-1:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_1242-7_gprs_v2_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp_1242-7_gprs_v2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_net_cp_1243-8_irc_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_net_cp_1243-8_irc:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:scalance_sc632-2c_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:scalance_sc632-2c:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:siplus_et_200sp_cp_1543sp-1_isec_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:siplus_et_200sp_cp_1543sp-1_isec:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:cp_1543-1_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:cp_1543-1:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_net_cp_1545-1_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_net_cp_1545-1:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_1543sp-1_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp_1543sp-1:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_net_cp1243-7_lte_eu_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_net_cp1243-7_lte_eu:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_1243-7_lte\/us_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp_1243-7_lte\/us:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_1542sp-1_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp_1542sp-1:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:scalance_sc636-2c_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:scalance_sc636-2c:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_1542sp-1_irc_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp_1542sp-1_irc:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:scalance_sc642-2c_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:scalance_sc642-2c:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:scalance_sc646-2c_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.3 OR cpe:2.3:h:siemens:scalance_sc646-2c:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:scalance_sc622-2c_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:scalance_sc622-2c:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:siplus_s7-1200_cp_1243-1_rail_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:siplus_s7-1200_cp_1243-1_rail:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:siplus_s7-1200_cp_1243-1_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:siplus_s7-1200_cp_1243-1:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:siplus_net_cp_1543-1_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:siplus_net_cp_1543-1:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:siplus_et_200sp_cp_1543sp-1_isec_tx_rail:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Feb. 08, 2022
Action Type Old Value New Value Added Reference https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf [No Types Assigned] -
Modified Analysis by [email protected]
Nov. 26, 2021
Action Type Old Value New Value Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ Mailing List, Third Party Advisory -
CVE Modified by [email protected]
Nov. 17, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ [No Types Assigned] -
CVE Modified by [email protected]
Nov. 10, 2021
Action Type Old Value New Value Removed Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ [Mailing List, Third Party Advisory] -
Modified Analysis by [email protected]
Nov. 04, 2021
Action Type Old Value New Value Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ Mailing List, Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Oct. 30, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ [No Types Assigned] -
CVE Modified by [email protected]
Oct. 28, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/ [No Types Assigned] Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/ [No Types Assigned] -
Initial Analysis by [email protected]
Oct. 21, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://github.com/strongswan/strongswan/releases/tag/5.9.4 No Types Assigned https://github.com/strongswan/strongswan/releases/tag/5.9.4 Third Party Advisory Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html Mailing List, Third Party Advisory Changed Reference Type https://www.debian.org/security/2021/dsa-4989 No Types Assigned https://www.debian.org/security/2021/dsa-4989 Third Party Advisory Changed Reference Type https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html No Types Assigned https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html Exploit, Vendor Advisory Added CWE NIST CWE-190 Added CPE Configuration OR *cpe:2.3:a:strongswan:strongswan:*:*:*:*:*:*:*:* versions from (including) 4.2.10 up to (excluding) 5.9.4 Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Oct. 20, 2021
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html [No Types Assigned] -
CVE Modified by [email protected]
Oct. 19, 2021
Action Type Old Value New Value Added Reference https://www.debian.org/security/2021/dsa-4989 [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-41991 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-41991
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
8.12 }} 1.27%
score
0.94375
percentile
CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability