CVE-2021-21707
Apache HTTP Server XML Parser NUL Injection Vulnerability
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.
INFO
Published Date :
Nov. 29, 2021, 7:15 a.m.
Last Modified :
Feb. 16, 2023, 3:07 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
1.4
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-21707 has a 2 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-21707
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-21707.
| URL | Resource |
|---|---|
| https://bugs.php.net/bug.php?id=79971 | Exploit Issue Tracking Patch Release Notes Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html | Issue Tracking Mailing List |
| https://security.netapp.com/advisory/ntap-20211223-0005/ | Third Party Advisory |
| https://www.debian.org/security/2022/dsa-5082 | Third Party Advisory |
| https://www.tenable.com/security/tns-2022-09 | Patch Release Notes Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Makefile Shell PHP
Audit your PHP version for known CVEs and patches
security-audit php composer-package docker-image security-scanner php-library security cves audit php-security hacktoberfest
PHP Makefile Shell
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-21707 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-21707 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Feb. 16, 2023
Action Type Old Value New Value Changed Reference Type https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html No Types Assigned https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html Issue Tracking, Mailing List Changed CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Dec. 15, 2022
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html [No Types Assigned] -
Modified Analysis by [email protected]
Oct. 05, 2022
Action Type Old Value New Value Changed Reference Type https://www.tenable.com/security/tns-2022-09 No Types Assigned https://www.tenable.com/security/tns-2022-09 Patch, Release Notes, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:* versions up to (excluding) 5.21.0 -
CVE Modified by [email protected]
Apr. 20, 2022
Action Type Old Value New Value Added Reference https://www.tenable.com/security/tns-2022-09 [No Types Assigned] -
Modified Analysis by [email protected]
Mar. 25, 2022
Action Type Old Value New Value Changed Reference Type https://bugs.php.net/bug.php?id=79971 Exploit, Issue Tracking, Release Notes, Vendor Advisory https://bugs.php.net/bug.php?id=79971 Exploit, Issue Tracking, Patch, Release Notes, Vendor Advisory Changed Reference Type https://www.debian.org/security/2022/dsa-5082 No Types Assigned https://www.debian.org/security/2022/dsa-5082 Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Feb. 21, 2022
Action Type Old Value New Value Added Reference https://www.debian.org/security/2022/dsa-5082 [No Types Assigned] -
Modified Analysis by [email protected]
Jan. 04, 2022
Action Type Old Value New Value Changed Reference Type https://bugs.php.net/bug.php?id=79971 Exploit, Release Notes, Vendor Advisory https://bugs.php.net/bug.php?id=79971 Exploit, Issue Tracking, Release Notes, Vendor Advisory Changed Reference Type https://security.netapp.com/advisory/ntap-20211223-0005/ No Types Assigned https://security.netapp.com/advisory/ntap-20211223-0005/ Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Dec. 23, 2021
Action Type Old Value New Value Added Reference https://security.netapp.com/advisory/ntap-20211223-0005/ [No Types Assigned] -
Initial Analysis by [email protected]
Nov. 30, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Changed Reference Type https://bugs.php.net/bug.php?id=79971 No Types Assigned https://bugs.php.net/bug.php?id=79971 Exploit, Release Notes, Vendor Advisory Added CWE NIST NVD-CWE-Other Added CPE Configuration OR *cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 7.3.0 up to (excluding) 7.3.33 *cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 7.4.0 up to (excluding) 7.4.26 *cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 8.0.0 up to (excluding) 8.0.13
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-21707 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-21707
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.22 }} 0.06%
score
0.60372
percentile