Double Free in FreeBSD
CVE-2021-29627
In FreeBSD 13.0-STABLE before n245050, 12.2-STABLE before r369525, 13.0-RC4 before p0, and 12.2-RELEASE before p6, listening socket accept filters implementing the accf_create callback incorrectly freed a process supplied argument string. Additional operations on the socket can lead to a double free or use after free.
Vulnerability class: Double Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (53.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- FreeBSD — versions 12.2, 13.0
- FreeBSD — versions FreeBSD 12.2-RELEASE before p6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security.FreeBSD.org/advisories/FreeBSD-SA-21:09.accept_filter.asc (Vendor Advisory)
- security.netapp.com/advisory/ntap-20210423-0007/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-29627?
- CVE-2021-29627 is a high-severity vulnerability in FreeBSD, classified under Double Free. CVSS score: 7.8/10. Published 2021-04-07.
- How severe is CVE-2021-29627?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-29627 known to be exploited?
- 10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.