What’s Vulnerable › Vulnerabilities

CVE-2020-7066: get_headers() silently truncates after a null byte

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-04-01 · updated 2026-06-17
• Weakness: CWE-170

Description

In PHP versions 7.2.x below 7.2.29, 7.3.x below 7.3.16 and 7.4.x below 7.4.4, while using get_headers() with user-supplied URL, if the URL contains zero (\0) character, the URL will be silently truncated at it. This may cause some software to make incorrect assumptions about the target of the get_headers() and possibly send some information to a wrong server.

Affected products

• Debian Linux: 8.0, 9.0, 10.0
• openSUSE Leap: 15.1
• PHP: from 7.2.0 before 7.2.29; from 7.3.0 before 7.3.16; from 7.4.0 before 7.4.4 — fixed in 7.2.29, 7.3.16, 7.4.4
• Tenable.sc: before 5.19.0; 5.19.0 — fixed in 5.19.0

How to fix

Upgrade to a fixed version: PHP 7.2.29, 7.3.16, 7.4.4; Tenable.sc 5.19.0. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00025.html
• https://bugs.php.net/bug.php?id=79329
• https://lists.debian.org/debian-lts-announce/2020/04/msg00021.html
• https://security.netapp.com/advisory/ntap-20200403-0001/
• https://usn.ubuntu.com/4330-2/
• https://www.debian.org/security/2020/dsa-4717
• https://www.debian.org/security/2020/dsa-4719
• https://www.tenable.com/security/tns-2021-14
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00025.html
• https://bugs.php.net/bug.php?id=79329
• https://lists.debian.org/debian-lts-announce/2020/04/msg00021.html
• https://security.netapp.com/advisory/ntap-20200403-0001/

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