Is CVE-2023-52892 in the CISA KEV catalog?

No. CVE-2023-52892 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-52892?

CVE-2023-52892 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2023-52892?

CVE-2023-52892 has an EPSS score of 0.38% (30th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-52892?

Upgrade php-phpseclib on debian 11 to 2.0.30-2+deb11u3 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2023-52892

HIGH

7.5

CVSS v3

NVD

Description

In phpseclib before 1.0.22, 2.x before 2.0.46, and 3.x before 3.0.33, some characters in Subject Alternative Name fields in TLS certificates are incorrectly allowed to have a special meaning in regular expressions (such as a + wildcard), leading to name confusion in X.509 certificate host verification.

CWE-436

How to fix

Remediation Available

php-phpseclibDebian

Fixed in:2.0.30-2+deb11u3CVE-2023-52892

Fixed in:2.0.42-1+deb12u3CVE-2023-52892

Fixed in:2.0.46-1CVE-2023-52892

php-phpseclibUbuntu

Fixed in:2.0.1-1ubuntu0.1~esm2USN-7404-1

Fixed in:2.0.9-1ubuntu0.1~esm2USN-7404-1

Fixed in:2.0.23-2ubuntu0.1~esm2USN-7404-1

Fixed in:2.0.36-1ubuntu0.1~esm2USN-7404-1

php-phpseclib3Ubuntu

Fixed in:3.0.13-1ubuntu0.1~esm1USN-7404-1

php-seclibUbuntu

Fixed in:1.0.1-3ubuntu0.1+esm1USN-7404-1

Fixed in:1.0.9-1ubuntu0.1~esm1USN-7404-1

Fixed in:1.0.18-2ubuntu0.1~esm1USN-7404-1

Fixed in:1.0.20-1ubuntu0.1~esm1USN-7404-1

phpseclibUbuntu

Fixed in:1.0.1-3ubuntu0.1+esm1USN-7404-1

Fixed in:1.0.9-1ubuntu0.1~esm1USN-7404-1

Fixed in:1.0.18-2ubuntu0.1~esm1USN-7404-1

Fixed in:1.0.20-1ubuntu0.1~esm1USN-7404-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.38%probability of exploitation in 30 days

30thpercentile

Low risk: more likely to be exploited than 30% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Release Notes1

github.com

Other references1

github.com

Related Vulnerabilities

Other CWE-436 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-25292	Critical	9.8	64%	-	Fix
CVE-2022-37436	Medium	5.3	58%	-	Fix
CVE-2021-28474	High	8.8	51%	-	Fix
CVE-2025-25291	Critical	9.8	20%	-	Fix
CVE-2026-63030	Critical	9.8	8.9%	KEV	Fix
CVE-2019-17596	High	7.5	4.7%	-	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 2025-10-22.