peter bassill · operator
$ cve CVE-2021-36159 JSON

CVE-2021-36159

9.1
CRITICAL · CVSS 3.1 · EPSS 2.6% (pctl 85)

In your normal cycle

Critical by CVSS (9.1), but no sign of active exploitation.

Description

libfetch before 2021-07-26, as used in apk-tools, xbps, and other products, mishandles numeric strings for the FTP and HTTP protocols. The FTP passive mode implementation allows an out-of-bounds read because strtol is used to parse the relevant numbers into address bytes. It does not check if the line ends prematurely. If it does, the for-loop condition checks for the '\0' terminator one byte too late.

Scoring

CVSS9.1 (CRITICAL, v3.1)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS2.64% — more likely to be exploited than 85% of all CVEs
WeaknessCWE-125
On CISA KEVno
Public exploitnone known
Published2021-08-03
Last modified2026-06-17

Affected (1)

VendorProduct
freebsdlibfetch

References

→ the Explorer  ·  watch your stack  ·  NVD