CVE-2021-28903

HIGHNVD 7.57.5—

7.5

A stack overflow in libyang <= v1.0.225 can cause a denial of service through function lyxml_parse_mem(). lyxml_parse_elem() function will be called recursively, which will consume stack space and lead to crash.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 64.2%
KEV: Not listed

Published

May 20, 2021

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://github.com/CESNET/libyang/issues/1453
cve@mitrehttps://security.gentoo.org/glsa/202107-54
af854a3a-2127-422b-91ae-364da2661108https://github.com/CESNET/libyang/issues/1453
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202107-54

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-674Uncontrolled Recursion

Data Freshness Timeline

(refreshed 11× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
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2026-05-26 16:18 UTCEG score recompute
2026-05-26 16:18 UTCGHSA enrichment
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2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-28903?

CVE-2021-28903 is a high vulnerability published on May 20, 2021. A stack overflow in libyang <= v1.0.225 can cause a denial of service through function lyxmlparsemem(). lyxmlparseelem() function will be called recursively, which will consume stack space and lead to crash.

When was CVE-2021-28903 disclosed?

CVE-2021-28903 was first published in the National Vulnerability Database on May 20, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-28903 actively exploited?

CVE-2021-28903 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-28903?

CVE-2021-28903 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-28903?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-28903, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-28903

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-28903?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (4)

Frequently asked(5)

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