Vulnerability · Published Jul 27, 2021 · Assigned by mitre
CVE-2021-31878
Medium 6.5
In plain English
A medium-severity security flaw in the asterisk package (Ubuntu). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.5% (higher than 85% of all known vulnerabilities).
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)2.5%top 15.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An issue was discovered in PJSIP in Asterisk before 16.19.1 and before 18.5.1. To exploit, a re-INVITE without SDP must be received after Asterisk has sent a BYE request.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2021-31878 |
| Ubuntu:24.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2021-31878 |
| Ubuntu:25.10 | asterisk | no fix listed | UBUNTU-CVE-2021-31878 |
| Ubuntu:26.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2021-31878 |
| Ubuntu:26.10 | asterisk | no fix listed | UBUNTU-CVE-2021-31878 |
Affected products (as reported)
References
- 20210722 AST-2021-007: Remote Crash Vulnerability in PJSIP channel driver mailing-list, x_refsource_FULLDISC
- http://packetstormsecurity.com/files/163638/Asterisk-Project-Security-Advisory-AST-2021-007.html x_refsource_MISC
- http://downloads.asterisk.org/pub/security/AST-2021-007.html x_refsource_MISC
- https://issues.asterisk.org/jira/browse/ASTERISK-29381 x_refsource_MISC
- https://downloads.digium.com/pub/security/AST-2021-007.html x_refsource_MISC