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Fencer Intel
high 7.5

CVE-2007-4661 json

The chunk_split function in string.c in PHP 5.2.3 does not properly calculate the needed buffer size due to precision loss when performing…

published 19y ago modified 4mo ago also EUVD-2007-4643

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

The chunk_split function in string.c in PHP 5.2.3 does not properly calculate the needed buffer size due to precision loss when performing integer arithmetic with floating point numbers, which has unknown attack vectors and impact, possibly resulting in a heap-based buffer overflow. NOTE: this is due to an incomplete fix for CVE-2007-2872.

Patch / fix

  • php RHEL 2 APPLICATION_STACK 5.2.3-3.el5s2
  • php-gd RHEL 2 APPLICATION_STACK 5.2.3-3.el5s2
  • php-cli RHEL 2 APPLICATION_STACK 5.2.3-3.el5s2
  • php-dba RHEL 2 APPLICATION_STACK 5.2.3-3.el5s2
  • php-pdo RHEL 2 APPLICATION_STACK 5.2.3-3.el5s2
  • php-xml RHEL 2 APPLICATION_STACK 5.2.3-3.el5s2
  • php-imap RHEL 2 APPLICATION_STACK 5.2.3-3.el5s2
  • php-ldap RHEL 2 APPLICATION_STACK 5.2.3-3.el5s2

red hat advisories RHSA-2007:0917

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2007-4661 updated

php size calculation in chunk_split

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.36% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-14).

Exploits and checks

  • cvs.php.net http://cvs.php.net/viewvc.cgi/php-src/ext/standard/string.c?r1=1.445.2.14.2.58&r2=1.445.2.14.2.59 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-399 Resource Management Errors
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.