Is CVE-2010-1866 being actively exploited?

CVE-2010-1866 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2010-1866?

CVE-2010-1866 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2010-1866

CRITICAL · CVSS 9.8EPSS 6.7%EU EUVD

The dechunk filter in PHP 5.3 through 5.3.2, when decoding an HTTP chunked encoding stream, allows context-dependent attackers to cause a denial of service (crash) and possibly trigger memory corruption via a negative chunk size, which bypasses a signed comparison, related to an integer overflow in the chunk size decoder.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-190
EPSS score: 6.7% (94th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2010-1886)
Published: May 7, 2010
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2010-1886 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

opensuse / opensuse
opensuse / opensuse
opensuse / opensuse
php / php
suse / linux enterprise
suse / linux enterprise
suse / linux enterprise

References

http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00006.html(Mailing List)
http://php-security.org/2010/05/02/mops-2010-003-php-dechunk-filter-signed-comparison-vulnerability/index.html(Broken Link, Exploit)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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