Cyber Resilience

CVE-2025-3225

HighPublic PoC

Published: 07 July 2025

Published
07 July 2025
Modified
30 July 2025
KEV Added
—
Patch
—
CVSS Score v3 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0034 57.5th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-3225 is a high-severity XML Entity Expansion (CWE-776) vulnerability in Llamaindex Llamaindex. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked in the top 42.5% 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

An XML Entity Expansion vulnerability, also known as a 'billion laughs' attack, exists in the sitemap parser of the run-llama/llama_index repository, specifically affecting version v0.12.21. This vulnerability allows an attacker to supply a malicious Sitemap XML, leading to a Denial…

more

of Service (DoS) by exhausting system memory and potentially causing a system crash. The issue is resolved in version v0.12.29.

CWE(s)
CWE-776

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
Why these techniques?

XML Entity Expansion (billion laughs) in sitemap parser enables memory exhaustion DoS via application exploitation.

Affected Assets

llamaindex
llamaindex
0.12.21 — 0.12.29

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References