Is CVE-2023-36661 in the CISA KEV catalog?

No. CVE-2023-36661 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-36661?

CVE-2023-36661 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2023-36661?

CVE-2023-36661 has an EPSS score of 3.06% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-36661?

Upgrade xmltooling on debian 11 to 3.2.0-3+deb11u1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2023-36661

HIGHEPSS 86th pctl

7.5

CVSS v3

NVD

Description

Shibboleth XMLTooling before 3.2.4, as used in OpenSAML and Shibboleth Service Provider, allows SSRF via a crafted KeyInfo element. (This is fixed in, for example, Shibboleth Service Provider 3.4.1.3 on Windows.)

CWE-918Server-Side Request Forgery (SSRF)

How to fix

Remediation Available

xmltoolingDebian

Fixed in:3.2.0-3+deb11u1CVE-2023-36661

Fixed in:3.2.3-1+deb12u1CVE-2023-36661

Fixed in:3.2.4-1CVE-2023-36661

libxmltooling6v5Ubuntu

Fixed in:1.5.6-2ubuntu0.3+esm1USN-6274-1

xmltoolingUbuntu

Fixed in:1.5.6-2ubuntu0.3+esm1USN-6274-1

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

AvailabilityHigh

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

Exploit Intelligence

3.06%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Vendor Advisory1

shibboleth.net

Third-Party Advisory1

debian.org

Related Vulnerabilities

Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-21893	High	8.2	100%	KEV + Ransom	-
CVE-2021-40438	Critical	9.0	100%	KEV	Fix
CVE-2021-34473	Critical	9.1	100%	KEV + Ransom	Fix
CVE-2021-26855	Critical	9.1	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-41040	High	8.8	100%	KEV + Ransom	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 2025-05-05.