CVE & CISA-KEV Catalog

CVE-2021-21424

MEDIUMEPSS 75th pctl

5.3

CVSS v3

Description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.

CWE-200Information Exposure CWE-203

How to fix

Remediation Available

symfonyDebian

Fixed in:4.4.19+dfsg-2CVE-2021-21424

Fixed in:4.4.19+dfsg-2CVE-2021-21424

Fixed in:4.4.19+dfsg-2CVE-2021-21424

Fixed in:4.4.19+dfsg-2CVE-2021-21424

php-symfonyUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-cacheUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-configUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-consoleUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-debugUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-processUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-property-accessUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-property-infoUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

php-symfony-security-bundleUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-security-coreUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-security-guardUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-serializerUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

php-symfony-var-dumperUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

symfonyUbuntu

Fixed in:3.4.6+dfsg-1ubuntu0.1+esm2USN-5290-1

Fixed in:4.3.8+dfsg-1ubuntu1+esm1USN-5290-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.71%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Patch2

Other references5

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.