What’s Vulnerable › Vulnerabilities

CVE-2020-7062: Null Pointer Dereference in PHP Session Upload Progress

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-02-27 · updated 2026-06-17
• Weakness: CWE-476

Description

In PHP versions 7.2.x below 7.2.28, 7.3.x below 7.3.15 and 7.4.x below 7.4.3, when using file upload functionality, if upload progress tracking is enabled, but session.upload_progress.cleanup is set to 0 (disabled), and the file upload fails, the upload procedure would try to clean up data that does not exist and encounter null pointer dereference, which would likely lead to a crash.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04, 19.10
• Debian Linux: 8.0, 9.0, 10.0
• openSUSE Leap: 15.1
• PHP: from 7.2.0 through 7.2.27; from 7.3.0 through 7.3.14; from 7.4.0 through 7.4.2

References

• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00023.html
• https://bugs.php.net/bug.php?id=79221
• https://lists.debian.org/debian-lts-announce/2020/03/msg00034.html
• https://security.gentoo.org/glsa/202003-57
• https://usn.ubuntu.com/4330-1/
• 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/2020-03/msg00023.html
• https://bugs.php.net/bug.php?id=79221
• https://lists.debian.org/debian-lts-announce/2020/03/msg00034.html
• https://security.gentoo.org/glsa/202003-57

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