Cyber Resilience

CVE-2021-26703

CriticalPublic PoC

Published: 01 March 2021

Published
01 March 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0668 91.4th percentile
Risk Priority 24 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-26703 is a critical-severity Improper Restriction of XML External Entity Reference (CWE-611) vulnerability in Eprints Eprints. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 8.6% 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

EPrints 3.4.2 allows remote attackers to read arbitrary files and possibly execute commands via crafted JSON/XML input to a cgi/ajax/phrase URI.

CWE(s)
CWE-611

Related Threats

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

Affected Assets

eprints
eprints
3.4.2

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CA-8 Penetration Testing
addresses: CWE-611

Penetration testing includes XML external entity payloads, detecting XXE vulnerabilities and enabling their mitigation.

SI-4 System Monitoring
addresses: CWE-611

Identifies XML external entity processing via monitoring of unusual file/network access or resource usage.

References