Vulnerability in Digium Asterisk

CVE-2021-31878

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.

EPSS: 0.024 (82.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

  • cve@mitre.org (mailing-list, Patch, x_refsource_FULLDISC, Mailing List, Third Party Advisory)
  • cve@mitre.org (Patch, VDB Entry, Third Party Advisory, x_refsource_MISC)
  • cve@mitre.org (Patch, x_refsource_MISC, Vendor Advisory)
  • cve@mitre.org (Exploit, x_refsource_MISC, Issue Tracking, Vendor Advisory)
  • cve@mitre.org (Patch, x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-31878?
CVE-2021-31878 is a medium-severity vulnerability in Digium Asterisk, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2021-07-30.
How severe is CVE-2021-31878?
Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2021-31878 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.