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Fencer Intel
medium 4.3

CVE-2011-1471 json

Integer signedness error in zip_stream.c in the Zip extension in PHP before 5.3.6 allows context-dependent attackers to cause a denial of s…

published 2011-03-20 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1476

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
13.2%
EPSS 13.2% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

Integer signedness error in zip_stream.c in the Zip extension in PHP before 5.3.6 allows context-dependent attackers to cause a denial of service (CPU consumption) via a malformed archive file that triggers errors in zip_fread function calls.

Patch / fix

  • php php 5.2.11, 5.3.6
  • php RHEL 6 5.3.3-3.el6_1.3
  • php53 RHEL 5 5.3.3-1.el5_7.3
  • php-gd RHEL 6 5.3.3-3.el6_1.3
  • php-cli RHEL 6 5.3.3-3.el6_1.3
  • php-dba RHEL 6 5.3.3-3.el6_1.3
  • php-pdo RHEL 6 5.3.3-3.el6_1.3
  • php-xml RHEL 6 5.3.3-3.el6_1.3
  • php-zts RHEL 6 5.3.3-3.el6_1.3

red hat advisories RHSA-2011:1423

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-2011-1471 updated cvss 4.3

php: DoS (excessive CPU consumption) by processing certain Zip archive files

  • Red Hat Enterprise Linux (v. 5 server) php53 5.3.3-1.el5_7.3, php53-gd 5.3.3-1.el5_7.3, php53-cli 5.3.3-1.el5_7.3, php53-dba 5.3.3-1.el5_7.3, php53-pdo 5.3.3-1.el5_7.3, php53-xml 5.3.3-1.el5_7.3, +14 more Red Hat Enterprise Linux Server (v. 6) php 5.3.3-3.el6_1.3, php-gd 5.3.3-3.el6_1.3, php-cli 5.3.3-3.el6_1.3, php-pdo 5.3.3-3.el6_1.3, php-xml 5.3.3-3.el6_1.3, php-ldap 5.3.3-3.el6_1.3, +6 more Red Hat Enterprise Linux Server Optional (v. 6) php 5.3.3-3.el6_1.3, php-dba 5.3.3-3.el6_1.3, php-zts 5.3.3-3.el6_1.3, php-imap 5.3.3-3.el6_1.3, php-intl 5.3.3-3.el6_1.3, php-snmp 5.3.3-3.el6_1.3, +8 more Red Hat RHEL Desktop Workstation (v. 5 client) php53 5.3.3-1.el5_7.3, php53-gd 5.3.3-1.el5_7.3, php53-cli 5.3.3-1.el5_7.3, php53-dba 5.3.3-1.el5_7.3, php53-pdo 5.3.3-1.el5_7.3, php53-xml 5.3.3-1.el5_7.3, +14 more
    fixed: vendor fix RHSA-2011:1423
  • Red Hat Enterprise Linux 4 php Red Hat Enterprise Linux 5 php
    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

Timeline

  1. First public exploit (EDB-35485)
  2. Published

Exploit prediction

13.19% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-35485 PHP < 5.3.6 'Zip' Extension - 'zip_fread()' Denial of Service dos, 2011-03-10
  • bugs.php.net http://bugs.php.net/bug.php?id=49072 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness
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.