CVE-2010-1866 EXPLOIT
9.8
CRITICAL · CVSS 3.1 · EPSS 6.7% (pctl 94)
Patch early
A public exploit exists.
Description
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 6.72% — more likely to be exploited than 94% of all CVEs |
| Weakness | CWE-190 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2010-05-07 |
| Last modified | 2026-06-16 |
Affected (3)
| Vendor | Product |
|---|---|
| opensuse | opensuse |
| php | php |
| suse | linux enterprise |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | PHP 5.3 - 'PHP_dechunk()' HTTP Chunked Encoding Integer Overflow | 2010-05-02 |
References
- http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00006.html
- http://php-security.org/2010/05/02/mops-2010-003-php-dechunk-filter-signed-comparison-vulnerability/index.html
- http://lists.opensuse.org/opensuse-security-announce/2010-09/msg00006.html
- http://php-security.org/2010/05/02/mops-2010-003-php-dechunk-filter-signed-comparison-vulnerability/index.html
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