What is CVE-2021-21707?

CVE-2021-21707 is a medium-severity vulnerability in Php Group, classified under CWE-159. CVSS score: 5.3/10. Published 2021-11-29.

How severe is CVE-2021-21707?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2021-21707 known to be exploited?

6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Php Group

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. If that filename contains URL-encoded NUL character, this may…

EPSS: 0.006 (68.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Php Group — versions 7.3.x, 7.4.x, 8.0.X

Weakness classification (CWE)

CWE-159

Public proof-of-concept exploits

References

bugs.php.net/bug.php
security.netapp.com/advisory/ntap-20211223-0005/
DSA-5082 (vendor-advisory)
www.tenable.com/security/tns-2022-09
[debian-lts-announce] 20221215 [SECURITY] [DLA 3243-1] php7.3 security update (mailing-list)

Frequently asked questions

What is CVE-2021-21707?: CVE-2021-21707 is a medium-severity vulnerability in Php Group, classified under CWE-159. CVSS score: 5.3/10. Published 2021-11-29.
How severe is CVE-2021-21707?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2021-21707 known to be exploited?: 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.