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CVE-2021-21707

MEDIUM
Published 2021-11-29T06:25:08.814960Z
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Expert Analysis

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CVSS Score

V3.1
5.3
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.009
probability
of exploitation in the wild

There is a 0.9% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.749
Higher than 74.9% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
LOW
Integrity
NONE
Availability
NONE

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

PHP Group

PHP

Affected Versions:

7.3.x 7.4.x 8.0.X

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed MODERATE

GHSA-qh78-qfw9-93x9

Advisory Details

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 Scoring

CVSS Score

5.0

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-21707
WEB https://bugs.php.net/bug.php?id=79971
WEB https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html
WEB https://security.netapp.com/advisory/ntap-20211223-0005
WEB https://www.debian.org/security/2022/dsa-5082
WEB https://www.tenable.com/security/tns-2022-09

Advisory provided by GitHub Security Advisory Database. Published: November 30, 2021, Modified: March 26, 2022

References

https://bugs.php.net/bug.php?id=79971
https://security.netapp.com/advisory/ntap-20211223-0005/
https://www.debian.org/security/2022/dsa-5082
https://www.tenable.com/security/tns-2022-09
https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html
Published: 2021-11-29T06:25:08.814960Z
Last Modified: 2024-09-17T03:38:22.394Z
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