CVE-2023-36661: Shibboleth XMLTooling before 3.2.4, as used in OpenSAML and Shibboleth Service Provider, allows SSRF via a cra

Q: How do I fix CVE-2023-36661?

xmltooling: upgrade to 3.2.4; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2023-36661 being exploited?

CVE-2023-36661 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-36661 affect?

CVE-2023-36661 affects xmltooling, debian linux. Severity is high (CVSS 7.5). 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.)

Q: How urgent is CVE-2023-36661?

Priority 63/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

This week

HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2023-36661 is a high-severity flaw (CVSS 7.5) affecting xmltooling, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.)

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-918
Published	2023-06-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · shibboleth

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-06-25 22:15 UTCPublished CVE record published
2026-06-17 06:06 UTCUpdated Record last modified

shibboleth xmltooling UPGRADE

Affected: < 3.2.4

Fixed in: 3.2.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy xmltooling || rpm -q xmltooling || xmltooling --version

2. UPGRADE to 3.2.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade xmltooling

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xmltooling

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 11.0 · 12.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Metasploit: Ivanti Connect Secure Unauthenticated Remote Code Execution

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-36661?

xmltooling: upgrade to 3.2.4; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-36661 being exploited?

CVE-2023-36661 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-36661 affect?

CVE-2023-36661 affects xmltooling, debian linux. Severity is high (CVSS 7.5). 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.)

How urgent is CVE-2023-36661?

Priority 63/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Windows vulnerabilities · Debian vulnerabilities

References

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