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No exploitation reportedFix available

CVE-2021-28902

No exploitation reported by the sources we read.

  • Published2021-05-20
  • WeaknessCWE-252

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In function read_yin_container() in libyang <= v1.0.225, it doesn't check whether the value of retval->ext[r] is NULL. In some cases, it can be NULL, which leads to the operation of retval->ext[r]->flags that results in a crash.

Timeline

dates in UTC
  1. 2021-05-2019:15CVE publishedNVD

Versions per branch

NVD
Cesnet libyang
BranchAffectedFixed in
1.0≤ 1.0.225no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libyangUbuntu:22.04:LTSall versions · no fixed version listed
  • libyangUbuntu:20.04:LTSall versions · no fixed version listed
  • libyangSUSE:Linux Enterprise Module for Server Applications 15 SP4all versions · fixed in 1.0.184-150300.3.6.1
  • libyangSUSE:Linux Enterprise Module for Server Applications 15 SP3all versions · fixed in 1.0.184-150300.3.6.1
  • libyangopenSUSE:Leap 15.4all versions · fixed in 1.0.184-150300.3.6.1
  • libyangopenSUSE:Leap 15.3all versions · fixed in 1.0.184-150300.3.6.1
  • libyangDebian:14all versions · fixed in 3.4.2+dfsg-2
  • libyangDebian:13all versions · fixed in 3.4.2+dfsg-2

2 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-28902 Red Hat Product Security2 known affected

    libyang: NULL pointer dereference in read_yin_container()

    libyang as a component of Red Hat Enterprise Linux 8 · libyang.src as a component of Red Hat Enterprise Linux 8

Full record on NVD

Fix

  1. No fix planned, says the vendor Red Hat Product Security CVE-2021-28902 · 2 productsWill not fix

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-05-20
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-wcmm-c9rc-qjcj

Frequently asked questions

What is CVE-2021-28902?

In function read_yin_container() in libyang <= v1.0.225, it doesn't check whether the value of retval->ext[r] is NULL. In some cases, it can be NULL, which leads to the operation of retval->ext[r]->flags that results in a crash.

Is CVE-2021-28902 actively exploited?

Active exploitation of CVE-2021-28902 has not been confirmed. Its EPSS score was 1.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-28902?

CVE-2021-28902 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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