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CVE-2021-28903

Published: 20 May 2021

A stack overflow in libyang <= v1.0.225 can cause a denial of service through function lyxml_parse_mem(). lyxml_parse_elem() function will be called recursively, which will consume stack space and lead to crash.

Notes

AuthorNote
sbeattie
fix introduces hard recursion limit

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
libyang
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Needed

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Needed

kinetic Ignored
(end of life, was needed)
lunar Does not exist

mantic Does not exist

trusty Does not exist

upstream
Released (1.0.240)
xenial Ignored
(end of standard support)
Patches:
upstream: https://github.com/CESNET/libyang/commit/298b30ea4ebee137226acf9bb38678bd82704582

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H