CVE-2021-21705 is a medium-severity vulnerability affecting PHP versions 7.3.x, 7.4.x, and 8.0.x, where the filter_var() function with FILTER_VALIDATE_URL incorrectly validates URLs containing an invalid password field. This flaw can lead to misinterpretation of URLs, potentially causing applications to connect to unintended servers or make incorrect access decisions. The vulnerability has a CVSS score of 5.3, indicating a network attack vector with low complexity and a low impact on integrity, but no impact on confidentiality or availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 7.3.0, < 7.3.29CPE matchmatch criteria | cpe:2.3:a:php:php:*:*:*:*:*:*:*:* | ||
>= 7.4.0, < 7.4.21CPE matchmatch criteria | cpe:2.3:a:php:php:*:*:*:*:*:*:*:* | ||
>= 8.0.0, < 8.0.8CPE matchmatch criteria | cpe:2.3:a:php:php:*:*:*:*:*:*:*:* | ||
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* | ||
8.2CPE matchmatch criteria | cpe:2.3:a:oracle:sd-wan_aware:8.2:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.