Is CVE-2021-21702 in the CISA KEV catalog?

No. CVE-2021-21702 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21702?

CVE-2021-21702 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-21702?

CVE-2021-21702 has an EPSS score of 3.18% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21702?

Upgrade php7.4 on debian 11 to 7.4.15-1 or later. Fixes are available for 21 affected products.

CVE & CISA-KEV Catalog

CVE-2021-21702

MEDIUMEPSS 87th pctl

5.3

CVSS v3

NVD

Description

In PHP versions 7.3.x below 7.3.27, 7.4.x below 7.4.15 and 8.0.x below 8.0.2, when using SOAP extension to connect to a SOAP server, a malicious SOAP server could return malformed XML data as a response that would cause PHP to access a null pointer and thus cause a crash.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

php7.4Debian

Fixed in:7.4.15-1CVE-2021-21702

libapache2-mod-php5Ubuntu

Fixed in:5.5.9+dfsg-1ubuntu4.29+esm14USN-5006-2

libapache2-mod-php7.0Ubuntu

Fixed in:7.0.33-0ubuntu0.16.04.16+esm1USN-5006-2

libapache2-mod-php7.2Ubuntu

Fixed in:7.2.24-0ubuntu0.18.04.8USN-5006-1

libapache2-mod-php7.4Ubuntu

Fixed in:7.4.3-4ubuntu2.5USN-5006-1

php5Ubuntu

Fixed in:5.5.9+dfsg-1ubuntu4.29+esm14USN-5006-2

php5-cgiUbuntu

Fixed in:5.5.9+dfsg-1ubuntu4.29+esm14USN-5006-2

php5-cliUbuntu

Fixed in:5.5.9+dfsg-1ubuntu4.29+esm14USN-5006-2

php5-fpmUbuntu

Fixed in:5.5.9+dfsg-1ubuntu4.29+esm14USN-5006-2

php7.0Ubuntu

Fixed in:7.0.33-0ubuntu0.16.04.16+esm1USN-5006-2

php7.0-cgiUbuntu

Fixed in:7.0.33-0ubuntu0.16.04.16+esm1USN-5006-2

php7.0-cliUbuntu

Fixed in:7.0.33-0ubuntu0.16.04.16+esm1USN-5006-2

php7.0-fpmUbuntu

Fixed in:7.0.33-0ubuntu0.16.04.16+esm1USN-5006-2

php7.2Ubuntu

Fixed in:7.2.24-0ubuntu0.18.04.8USN-5006-1

php7.2-cgiUbuntu

Fixed in:7.2.24-0ubuntu0.18.04.8USN-5006-1

php7.2-cliUbuntu

Fixed in:7.2.24-0ubuntu0.18.04.8USN-5006-1

php7.2-fpmUbuntu

Fixed in:7.2.24-0ubuntu0.18.04.8USN-5006-1

php7.4Ubuntu

Fixed in:7.4.3-4ubuntu2.5USN-5006-1

php7.4-cgiUbuntu

Fixed in:7.4.3-4ubuntu2.5USN-5006-1

php7.4-cliUbuntu

Fixed in:7.4.3-4ubuntu2.5USN-5006-1

php7.4-fpmUbuntu

Fixed in:7.4.3-4ubuntu2.5USN-5006-1

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

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

3.18%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Patch1

oracle.com

Vendor Advisory1

bugs.php.net

Third-Party Advisory5

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	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.