CVE-2021-21707
Last modified
CVE-2021-21707 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended.. EPSS estimates a 25.95% chance of exploitation in the next 30 days.
Description
In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Php | Php | >= 7.3.0, < 7.3.33 |
| Php | Php | >= 7.4.0, < 7.4.26 |
| Php | Php | >= 8.0.0, < 8.0.13 |
| Netapp | Clustered Data Ontap | All versions |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
| Tenable | Tenable.Sc | < 5.21.0 |
References
- https://bugs.php.net/bug.php?id=79971Exploit, Issue Tracking, Patch, Release Notes, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00030.htmlIssue Tracking, Mailing List
- https://security.netapp.com/advisory/ntap-20211223-0005/Third Party Advisory
- https://www.debian.org/security/2022/dsa-5082Third Party Advisory
- https://www.tenable.com/security/tns-2022-09Patch, Release Notes, Third Party Advisory
- https://bugs.php.net/bug.php?id=79971Exploit, Issue Tracking, Patch, Release Notes, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00030.htmlIssue Tracking, Mailing List
- https://security.netapp.com/advisory/ntap-20211223-0005/Third Party Advisory
- https://www.debian.org/security/2022/dsa-5082Third Party Advisory
- https://www.tenable.com/security/tns-2022-09Patch, Release Notes, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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