VDB
DEBIAN-CVE-2021-21707
DEBIAN-CVE-2021-21707
PUBLISHED
CVSS 5.300000190734863 MEDIUM
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.
Risk Scores
CVSS 3.1
5.300000190734863
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:11 | php7.4 | 0, 7.4.21-1, 7.4.25-1 |
Exploit Intelligence
- Exploit for the PHP 8.1.0-dev backdoor vulnerability (CVE-2021-21707) (github-poc-repo)
- Exploit for the PHP 8.1.0-dev backdoor vulnerability (CVE-2021-21707) (github-poc)
- cve_db.json (github-poc)
Timeline
- Nov 29, 2021 CVE Published
- Apr 28, 2026 CVE Updated