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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.025 (83.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.024 · newest: 0.025 · change: +0.000
Affected products
- Digium Asterisk — versions 16.17.0, 16.18.0, 16.19.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- seclists.org/fulldisclosure/2021/Jul/48 (mailing-list, Patch, Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/163638/Asterisk-Project-Security-Advisory-AST-202… (Patch, VDB Entry, Third Party Advisory)
- downloads.asterisk.org/pub/security/AST-2021-007.html (Patch, Vendor Advisory)
- issues.asterisk.org/jira/browse/ASTERISK-29381 (Exploit, Issue Tracking, Vendor Advisory)
- downloads.digium.com/pub/security/AST-2021-007.html (Patch, 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.