# CVE-2003-1564

## Summary

- **CVE ID:** CVE-2003-1564
- **Severity:** UNKNOWN
- **CVSS Score:** 0.03
- **CWE:** N/A
- **Published:** Sep 2, 2008
- **Last Modified:** Mar 16, 2026

## Description

libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the "billion laughs attack."

## Affected Products

- n/a — n/a (n/a)

## References

- [CNA](http://secunia.com/advisories/31868)
- [CNA](http://xmlsoft.org/news.html)
- [CNA](http://www.stylusstudio.com/xmldev/200302/post20020.html)
- [CNA](http://www.reddit.com/r/programming/comments/65843/time_to_upgrade_libxml2)
- [CNA](http://mail.gnome.org/archives/xml/2008-August/msg00034.html)
- [CNA](http://www.redhat.com/support/errata/RHSA-2008-0886.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.65%
- **EPSS Percentile:** 70.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._