7.5

CVE-2021-31826: shibboleth service_provider NULL Pointer Dereference

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-31826DEBIAN-CVE-2021-31826DSA-4905-1
Published 27-04-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-31826 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in shibboleth service_provider. EPSS estimates a 2.00% chance of exploitation in the next 30 days, higher than 80.4% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
2.00%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 27-04-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

2.00%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

0.00 pp

From 2.00% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.00%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (issues.shibboleth.net)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • shibboleth-sp< 3.2.2+dfsg1-1 | < 3.0.4+dfsg1-1+deb10u2
Shibboleth1 product
Ubuntu1 product
  • shibboleth-sp< 3.0.4+dfsg1-1ubuntu0.2

3 vendors · 3 products

References

9 links