CVE-2021-26906
First published: Thu Feb 18 2021(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Digium Asterisk | >=13.0.0<13.38.2 | |
| Digium Asterisk | >=16.0.0<16.16.1 | |
| Digium Asterisk | >=17.0.0<17.9.2 | |
| Digium Asterisk | >=18.0<18.2.1 | |
| Digium Certified Asterisk | =16.8 | |
| Digium Certified Asterisk | =16.8-cert1-rc1 | |
| Digium Certified Asterisk | =16.8-cert1-rc2 | |
| Digium Certified Asterisk | =16.8-cert1-rc3 | |
| Digium Certified Asterisk | =16.8-cert1-rc4 | |
| Digium Certified Asterisk | =16.8-cert2 | |
| Digium Certified Asterisk | =16.8-cert3 | |
| Digium Certified Asterisk | =16.8-cert4 | |
| Digium Certified Asterisk | =16.8-cert4-rc1 | |
| Digium Certified Asterisk | =16.8-cert4-rc2 | |
| Digium Certified Asterisk | =16.8-cert4-rc3 | |
| Digium Certified Asterisk | =16.8-cert4-rc4 | |
| Digium Certified Asterisk | =16.8-cert5 |
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Reference Links
- http://packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisory-AST-2021-005.html
- http://seclists.org/fulldisclosure/2021/Feb/61
- https://downloads.asterisk.org/pub/security/
- https://downloads.asterisk.org/pub/security/AST-2021-005.html
- https://issues.asterisk.org/jira/browse/ASTERISK-29196
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2021-26906.
What is the severity of CVE-2021-26906?
The severity of CVE-2021-26906 is medium with a score of 5.9.
Which software versions are affected by CVE-2021-26906?
Digium Asterisk versions through 13.38.1, 14.x through 16.16.0, 17.x through 17.9.1, and 18.x through 18.2.0, as well as Certified Asterisk through 16.8-cert5 are affected by CVE-2021-26906.
How can a remote server potentially crash Asterisk due to CVE-2021-26906?
An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk.
Is there a fix available for CVE-2021-26906?
Yes, please refer to the official Asterisk project security advisory AST-2021-005 and download the necessary patches or updates from the Asterisk downloads page.
- collector/nvd-index
- agent/severity
- agent/weakness
- agent/references
- agent/author
- agent/event
- agent/type
- agent/description
- agent/remedy
- agent/last-modified-date
- agent/softwarecombine
- agent/first-publish-date
- agent/tags
- collector/mitre-cve
- source/MITRE
- vendor/digium
- canonical/digium asterisk
- version/digium asterisk/13.0.0
- version/digium asterisk/16.0.0
- version/digium asterisk/17.0.0
- version/digium asterisk/18.0
- canonical/digium certified asterisk
- version/digium certified asterisk/16.8
- version/digium certified asterisk/16.8-cert1-rc1
- version/digium certified asterisk/16.8-cert1-rc2
- version/digium certified asterisk/16.8-cert1-rc3
- version/digium certified asterisk/16.8-cert1-rc4
- version/digium certified asterisk/16.8-cert2
- version/digium certified asterisk/16.8-cert3
- version/digium certified asterisk/16.8-cert4
- version/digium certified asterisk/16.8-cert4-rc1
- version/digium certified asterisk/16.8-cert4-rc2
- version/digium certified asterisk/16.8-cert4-rc3
- version/digium certified asterisk/16.8-cert4-rc4
- version/digium certified asterisk/16.8-cert5