What’s Vulnerable › Vulnerabilities

CVE-2010-4699

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-01-18 · updated 2026-06-16
• Weakness: CWE-189

Description

The iconv_mime_decode_headers function in the Iconv extension in PHP before 5.3.4 does not properly handle encodings that are unrecognized by the iconv and mbstring (aka Multibyte String) implementations, which allows remote attackers to trigger an incomplete output array, and possibly bypass spam detection or have unspecified other impact, via a crafted Subject header in an e-mail message, as demonstrated by the ks_c_5601-1987 character set.

Affected products

• PHP: through 5.3.3; 1.0, 2.0, 2.0b10, 3.0, 3.0.1, 3.0.2 (+100)

References

• http://bugs.php.net/52941
• http://coding.derkeiler.com/Archive/PHP/php.general/2007-04/msg00605.html
• http://www.php.net/ChangeLog-5.php
• https://exchange.xforce.ibmcloud.com/vulnerabilities/64963
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12393
• http://bugs.php.net/52941
• http://coding.derkeiler.com/Archive/PHP/php.general/2007-04/msg00605.html
• http://www.php.net/ChangeLog-5.php
• https://exchange.xforce.ibmcloud.com/vulnerabilities/64963
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12393

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