CVE-2021-21375

Crash in receiving updated SDP answer after initial SDP negotiation failed

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In PJSIP version 2.10 and earlier, after an initial INVITE has been sent, when two 183 responses are received, with the first one causing negotiation failure, a crash will occur. This results in a denial of service.

PJSIP es una biblioteca de comunicación multimedia de código abierto y gratuita escrita en lenguaje C que implementa protocolos basados ??en estándares como SIP, SDP, RTP, STUN, TURN e ICE. En PJSIP versiones 2.10 y anteriores, después de que se haya enviado una INVITE inicial, cuando son recibidas dos respuestas 183, con la primera causando un fallo en la negociación, y se producirá un bloqueo. Esto resulta en una denegación de servicio

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-22 CVE Reserved
2021-03-10 CVE Published
2024-01-17 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-400: Uncontrolled Resource Consumption
CWE-754: Improper Check for Unusual or Exceptional Conditions

CAPEC

References (5)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2021/04/msg00023.html	Mailing List
https://lists.debian.org/debian-lts-announce/2021/05/msg00020.html	Mailing List

URL	Date	SRC
https://github.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvp	2024-08-03

URL	Date	SRC
https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365	2022-10-21

URL	Date	SRC
https://security.gentoo.org/glsa/202107-42	2022-10-21

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Teluu Search vendor "Teluu"		Pjsip Search vendor "Teluu" for product "Pjsip"				<= 2.10 Search vendor "Teluu" for product "Pjsip" and version " <= 2.10"		-		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