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CVE-2021-28906

25
FAUCET Score

CVE-2021-28906 is a high-severity vulnerability affecting libyang versions up to 1.0.225, where a missing NULL check in the read_yin_leaf() function can lead to a system crash. This vulnerability has a CVSS score of 7.5, indicating a high impact on availability, and can be exploited remotely without authentication or user interaction. There is currently no public exploit code available, nor is there evidence of active exploitation, and it has received minimal community or media attention.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.0.225CPE matchmatch criteria
cpe:2.3:a:cesnet:libyang:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.57%
Probability of exploitation in next 30 days
EPSS Percentile
72.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0157 is in the 55th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: libyang

Vendor Advisories (1)

redhatCVE-2021-28906Moderate

libyang: NULL pointer dereference in read_yin_leaf()

Mar 8, 2021

References

github.com / CESNET/libyang/issues/1455
ExploitIssue TrackingPatchThird Party Advisory
security.gentoo.org / glsa/202107-54
Third Party Advisory