CVE-2021-21705
Last modified
CVE-2021-21705 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using URL validation functionality via filter_var() function with FILTER_VALIDATE_URL parameter, an URL with invalid password field can be accepted as valid. This can lead to the code incorrectly parsing the URL and potentially leading to other security implications - like contacting a wrong server or making a wrong access decision.. EPSS estimates a 1.94% chance of exploitation in the next 30 days.
Description
In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using URL validation functionality via filter_var() function with FILTER_VALIDATE_URL parameter, an URL with invalid password field can be accepted as valid. This can lead to the code incorrectly parsing the URL and potentially leading to other security implications - like contacting a wrong server or making a wrong access decision.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Php | Php | >= 7.3.0, < 7.3.29 |
| Php | Php | >= 7.4.0, < 7.4.21 |
| Php | Php | >= 8.0.0, < 8.0.8 |
| Netapp | Clustered Data Ontap | All versions |
| Oracle | Sd-Wan Aware | 8.2 |
References
- https://bugs.php.net/bug.php?id=81122Exploit, Issue Tracking, Patch, Vendor Advisory
- https://security.gentoo.org/glsa/202209-20Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211029-0006/Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Vendor Advisory
- https://bugs.php.net/bug.php?id=81122Exploit, Issue Tracking, Patch, Vendor Advisory
- https://security.gentoo.org/glsa/202209-20Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211029-0006/Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Vendor 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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