CVE-2021-26906

Severity Score

5.9

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.

Se detectó un problema en el archivo res_pjsip_session.c en Digium Asterisk versiones hasta 13.38.1; 14.x, 15.x y 16.xa 16.16.0; 17.xa 17.9.1; y 18.xa 18.2.0, y Certified Asterisk versiones hasta 16.8-cert5. Una vulnerabilidad de negociación SDP en PJSIP permite a un servidor remoto bloquear potencialmente Asterisk mediante el envío de respuestas SIP específicas que causan un fallo en la negociación SDP

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

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

2021-02-08 CVE Reserved
2021-02-18 CVE Published
2023-11-04 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-404: Improper Resource Shutdown or Release

CAPEC

References (5)

URL	Tag	Source
http://packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisory-AST-2021-005.html	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
http://seclists.org/fulldisclosure/2021/Feb/61	2021-02-24
https://issues.asterisk.org/jira/browse/ASTERISK-29196	2021-02-24

URL	Date	SRC
https://downloads.asterisk.org/pub/security	2021-02-24
https://downloads.asterisk.org/pub/security/AST-2021-005.html	2021-02-24

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Digium Search vendor "Digium"		Asterisk Search vendor "Digium" for product "Asterisk"				>= 13.0.0 < 13.38.2 Search vendor "Digium" for product "Asterisk" and version " >= 13.0.0 < 13.38.2"		-		Affected
Digium Search vendor "Digium"		Asterisk Search vendor "Digium" for product "Asterisk"				>= 16.0.0 < 16.16.1 Search vendor "Digium" for product "Asterisk" and version " >= 16.0.0 < 16.16.1"		-		Affected
Digium Search vendor "Digium"		Asterisk Search vendor "Digium" for product "Asterisk"				>= 17.0.0 < 17.9.2 Search vendor "Digium" for product "Asterisk" and version " >= 17.0.0 < 17.9.2"		-		Affected
Digium Search vendor "Digium"		Asterisk Search vendor "Digium" for product "Asterisk"				>= 18.0 < 18.2.1 Search vendor "Digium" for product "Asterisk" and version " >= 18.0 < 18.2.1"		-		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		-		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert1-rc1		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert1-rc2		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert1-rc3		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert1-rc4		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert2		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert3		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert4		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert4-rc1		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert4-rc2		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert4-rc3		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert4-rc4		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert5		Affected