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CVE-2021-21705

MEDIUM
Published 2021-10-04T04:00:15.654508Z
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CVSS Score

V3.1
4.3
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.003
probability
of exploitation in the wild

There is a 0.3% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.523
Higher than 52.3% of all CVEs

Attack Vector Metrics

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

Impact Metrics

Confidentiality
LOW
Integrity
NONE
Availability
NONE

Description

In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using URL validation functionality via filter_var() function with FILTER_VALIDATE_URL parameter, an URL with invalid password field can be accepted as valid. This can lead to the code incorrectly parsing the URL and potentially leading to other security implications - like contacting a wrong server or making a wrong access decision.

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-rxcr-7xjm-f9c9

Advisory Details

In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using URL validation functionality via filter_var() function with FILTER_VALIDATE_URL parameter, an URL with invalid password field can be accepted as valid. This can lead to the code incorrectly parsing the URL and potentially leading to other security implications - like contacting a wrong server or making a wrong access decision.

CVSS Scoring

CVSS Score

5.0

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-21705
WEB https://bugs.php.net/bug.php?id=81122
WEB https://security.gentoo.org/glsa/202209-20
WEB https://security.netapp.com/advisory/ntap-20211029-0006
WEB https://www.oracle.com/security-alerts/cpujan2022.html

Advisory provided by GitHub Security Advisory Database. Published: May 24, 2022, Modified: September 30, 2022

References

https://bugs.php.net/bug.php?id=81122
https://www.oracle.com/security-alerts/cpujan2022.html
https://security.netapp.com/advisory/ntap-20211029-0006/
https://security.gentoo.org/glsa/202209-20
Published: 2021-10-04T04:00:15.654508Z
Last Modified: 2024-09-17T04:09:29.556Z
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