CVE-2021-41991

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La caché de certificados en memoria en strongSwan versiones anteriores a 5.9.4, presenta un desbordamiento de enteros remoto al recibir muchas peticiones con diferentes certificados para llenar la caché y posteriormente desencadenar la sustitución de las entradas de la caché. El código intenta seleccionar una entrada de caché menos usada mediante un generador de números aleatorios, pero esto no es realizado correctamente. Una ejecución de código remota podría ser una pequeña posibilidad

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-10-04 CVE Reserved
2021-10-18 CVE Published
2024-07-03 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-190: Integer Overflow or Wraparound

CAPEC

References (8)

URL	Tag	Source
https://github.com/strongswan/strongswan/releases/tag/5.9.4	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html	Mailing List
https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.html	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC
https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4	2023-11-07
https://www.debian.org/security/2021/dsa-4989	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Siemens Search vendor "Siemens"	Siplus Et 200sp Cp 1542sp-1 Irc Tx Rail Firmware Search vendor "Siemens" for product "Siplus Et 200sp Cp 1542sp-1 Irc Tx Rail Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Siplus Et 200sp Cp 1542sp-1 Irc Tx Rail Search vendor "Siemens" for product "Siplus Et 200sp Cp 1542sp-1 Irc Tx Rail"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Cp 1243-1 Firmware Search vendor "Siemens" for product "Simatic Cp 1243-1 Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Cp 1243-1 Search vendor "Siemens" for product "Simatic Cp 1243-1"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Cp 1242-7 Gprs V2 Firmware Search vendor "Siemens" for product "Simatic Cp 1242-7 Gprs V2 Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Cp 1242-7 Gprs V2 Search vendor "Siemens" for product "Simatic Cp 1242-7 Gprs V2"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Net Cp 1243-8 Irc Firmware Search vendor "Siemens" for product "Simatic Net Cp 1243-8 Irc Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Net Cp 1243-8 Irc Search vendor "Siemens" for product "Simatic Net Cp 1243-8 Irc"	-	-	Safe
Siemens Search vendor "Siemens"	Scalance Sc632-2c Firmware Search vendor "Siemens" for product "Scalance Sc632-2c Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Scalance Sc632-2c Search vendor "Siemens" for product "Scalance Sc632-2c"	-	-	Safe
Siemens Search vendor "Siemens"	Siplus Et 200sp Cp 1543sp-1 Isec Firmware Search vendor "Siemens" for product "Siplus Et 200sp Cp 1543sp-1 Isec Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Siplus Et 200sp Cp 1543sp-1 Isec Search vendor "Siemens" for product "Siplus Et 200sp Cp 1543sp-1 Isec"	-	-	Safe
Siemens Search vendor "Siemens"	Cp 1543-1 Firmware Search vendor "Siemens" for product "Cp 1543-1 Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Cp 1543-1 Search vendor "Siemens" for product "Cp 1543-1"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Net Cp 1545-1 Firmware Search vendor "Siemens" for product "Simatic Net Cp 1545-1 Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Net Cp 1545-1 Search vendor "Siemens" for product "Simatic Net Cp 1545-1"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Cp 1543sp-1 Firmware Search vendor "Siemens" for product "Simatic Cp 1543sp-1 Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Cp 1543sp-1 Search vendor "Siemens" for product "Simatic Cp 1543sp-1"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Net Cp1243-7 Lte Eu Firmware Search vendor "Siemens" for product "Simatic Net Cp1243-7 Lte Eu Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Net Cp1243-7 Lte Eu Search vendor "Siemens" for product "Simatic Net Cp1243-7 Lte Eu"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Cp 1243-7 Lte\/us Firmware Search vendor "Siemens" for product "Simatic Cp 1243-7 Lte\/us Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Cp 1243-7 Lte\/us Search vendor "Siemens" for product "Simatic Cp 1243-7 Lte\/us"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Cp 1542sp-1 Firmware Search vendor "Siemens" for product "Simatic Cp 1542sp-1 Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Cp 1542sp-1 Search vendor "Siemens" for product "Simatic Cp 1542sp-1"	-	-	Safe
Siemens Search vendor "Siemens"	Scalance Sc636-2c Firmware Search vendor "Siemens" for product "Scalance Sc636-2c Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Scalance Sc636-2c Search vendor "Siemens" for product "Scalance Sc636-2c"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Cp 1542sp-1 Irc Firmware Search vendor "Siemens" for product "Simatic Cp 1542sp-1 Irc Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Cp 1542sp-1 Irc Search vendor "Siemens" for product "Simatic Cp 1542sp-1 Irc"	-	-	Safe
Siemens Search vendor "Siemens"	Scalance Sc642-2c Firmware Search vendor "Siemens" for product "Scalance Sc642-2c Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Scalance Sc642-2c Search vendor "Siemens" for product "Scalance Sc642-2c"	-	-	Safe
Siemens Search vendor "Siemens"	Scalance Sc646-2c Firmware Search vendor "Siemens" for product "Scalance Sc646-2c Firmware"	< 2.3 Search vendor "Siemens" for product "Scalance Sc646-2c Firmware" and version " < 2.3"	-	Affected	in	Siemens Search vendor "Siemens"	Scalance Sc646-2c Search vendor "Siemens" for product "Scalance Sc646-2c"	-	-	Safe
Siemens Search vendor "Siemens"	Scalance Sc622-2c Firmware Search vendor "Siemens" for product "Scalance Sc622-2c Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Scalance Sc622-2c Search vendor "Siemens" for product "Scalance Sc622-2c"	-	-	Safe
Siemens Search vendor "Siemens"	Siplus S7-1200 Cp 1243-1 Rail Firmware Search vendor "Siemens" for product "Siplus S7-1200 Cp 1243-1 Rail Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Siplus S7-1200 Cp 1243-1 Rail Search vendor "Siemens" for product "Siplus S7-1200 Cp 1243-1 Rail"	-	-	Safe
Siemens Search vendor "Siemens"	Siplus S7-1200 Cp 1243-1 Firmware Search vendor "Siemens" for product "Siplus S7-1200 Cp 1243-1 Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Siplus S7-1200 Cp 1243-1 Search vendor "Siemens" for product "Siplus S7-1200 Cp 1243-1"	-	-	Safe
Siemens Search vendor "Siemens"	Siplus Net Cp 1543-1 Firmware Search vendor "Siemens" for product "Siplus Net Cp 1543-1 Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Siplus Net Cp 1543-1 Search vendor "Siemens" for product "Siplus Net Cp 1543-1"	-	-	Safe
Siemens Search vendor "Siemens"	Siplus Et 200sp Cp 1543sp-1 Isec Tx Rail Firmware Search vendor "Siemens" for product "Siplus Et 200sp Cp 1543sp-1 Isec Tx Rail Firmware"	-	-	Affected	in	Siemens Search vendor "Siemens"	Siplus Et 200sp Cp 1543sp-1 Isec Tx Rail Search vendor "Siemens" for product "Siplus Et 200sp Cp 1543sp-1 Isec Tx Rail"	-	-	Safe
Strongswan Search vendor "Strongswan"		Strongswan Search vendor "Strongswan" for product "Strongswan"				>= 4.2.10 < 5.9.4 Search vendor "Strongswan" for product "Strongswan" and version " >= 4.2.10 < 5.9.4"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				35 Search vendor "Fedoraproject" for product "Fedora" and version "35"		-		Affected
Siemens Search vendor "Siemens"		Sinema Remote Connect Server Search vendor "Siemens" for product "Sinema Remote Connect Server"				-		-		Affected