Integer overflow in PHP
CVE-2010-1866
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.067 (93.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.067 · newest: 0.067 · change: 0.000
Affected products
- PHP
- openSUSE — versions 11.3, 11.1, 11.2
- SUSE Linux Enterprise — versions 11.0, 10.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- php-security.org/2010/05/02/mops-2010-003-php-dechunk-filter-signed-comparison-… (Exploit, Broken Link)
- lists.opensuse.org/opensuse-security-announce/2010-09/msg00006.html (vendor-advisory, Mailing List)
Frequently asked questions
- What is CVE-2010-1866?
- CVE-2010-1866 is a critical-severity vulnerability in PHP, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2010-05-07.
- How severe is CVE-2010-1866?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2010-1866 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.