Cyber Resilience

CVE-2021-28902

HighPublic PoC

Published: 20 May 2021

Published
20 May 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0040 61.5th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-28902 is a high-severity Unchecked Return Value (CWE-252) vulnerability in Cesnet Libyang. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 38.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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.

CWE(s)
CWE-252

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

cesnet
libyang
≤ 1.0.225

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References