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CVE-2021-28903

25
FAUCET Score

CVE-2021-28903 describes a stack overflow vulnerability in libyang versions up to and including v1.0.225, specifically within the lyxml_parse_mem() function, which can lead to a denial of service. This vulnerability has a CVSS score of 7.5 (HIGH), indicating it can be exploited remotely without authentication and result in a complete loss of availability. Currently, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

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
2.43%
Probability of exploitation in next 30 days
EPSS Percentile
82.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0243 is in the 69th percentile among its peer group of 51,506 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

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: libyang

Vendor Advisories (1)

redhatCVE-2021-28903Moderate

libyang: recursive call to lyxml_parse_mem() lead to crash

Mar 8, 2021

References

github.com / CESNET/libyang/issues/1453
ExploitIssue TrackingThird Party Advisory
security.gentoo.org / glsa/202107-54
Third Party Advisory