Is CVE-2021-31826 in the CISA KEV catalog?

No. CVE-2021-31826 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-31826?

CVE-2021-31826 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-31826?

CVE-2021-31826 has an EPSS score of 2.00% (78th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-31826?

Upgrade shibboleth-sp on debian 11 to 3.2.2+dfsg1-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-31826

HIGHEPSS 78th pctl

7.5

CVSS v3

NVD

Description

Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

shibboleth-spDebian

Fixed in:3.2.2+dfsg1-1CVE-2021-31826

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

2.00%probability of exploitation in 30 days

78thpercentile

Elevated risk: more likely to be exploited than 78% of all known CVEs.

References

Patch1

issues.shibboleth.net

Vendor Advisory1

shibboleth.net

Third-Party Advisory2

Other references1

git.shibboleth.net

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

Embed a live status badge for CVE-2021-31826

Markdown

[![CVE-2021-31826](https://tridentstack.com/cve/badge/CVE-2021-31826.svg)](https://tridentstack.com/cve/CVE-2021-31826)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-31826"><img src="https://tridentstack.com/cve/badge/CVE-2021-31826.svg" alt="CVE-2021-31826"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.