CVE-2021-31878

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

2.43% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 82.8% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-07-27 05:17Z5 YR AGO

Last updated

2024-08-03 23:10Z2 YR AGO

Reserved

2021-04-29

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-617Reachable AssertionBase

Data version

5.1

Document digest

69360310e99a6f86e4b7facd2fabaf7a4957f4c0387bb40bcc784e9518ffe452

• seclists.org20210722 AST-2021-007: Remote Crash Vulnerability in PJSIP channel driverhttp://seclists.org/fulldisclosure/2021/Jul/48mailing-listx_refsource_FULLDISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/163638/Asterisk-Project-Security-Advisory-AST-2021-007.htmlx_refsource_MISC
• downloads.asterisk.orghttp://downloads.asterisk.org/pub/security/AST-2021-007.htmlx_refsource_MISC
• issues.asterisk.orghttps://issues.asterisk.org/jira/browse/ASTERISK-29381x_refsource_MISC
• downloads.digium.comhttps://downloads.digium.com/pub/security/AST-2021-007.htmlx_refsource_MISC