Is CVE-2021-28904 in the CISA KEV catalog?

No. CVE-2021-28904 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-28904?

CVE-2021-28904 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-28904?

CVE-2021-28904 has an EPSS score of 1.41% (69th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-28904?

Upgrade libyang on debian 13 to 3.4.2+dfsg-2 or later.

CVE & CISA-KEV Catalog

CVE-2021-28904

HIGH

7.5

CVSS v3

NVD

Description

In function ext_get_plugin() in libyang <= v1.0.225, it doesn't check whether the value of revision is NULL. If revision is NULL, the operation of strcmp(revision, ext_plugins[u].revision) will lead to a crash.

CWE-252

How to fix

Remediation Available

libyangDebian

Fixed in:3.4.2+dfsg-2CVE-2021-28904

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

1.41%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Exploit1

github.com

Third-Party Advisory1

security.gentoo.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.