CVE-2021-21707
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 26.0%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 25.95% probability · 98th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-159
- Affected
- php/php · netapp/clustered data ontap · debian/debian linux · tenable/tenable.sc
- Source
- security@php.net
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.