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CVE-2020-5261

18
FAUCET Score

CVE-2020-5261 describes a faulty Token Replay Detection implementation in Sustainsys.Saml2 for ASP.NET, affecting versions greater than 2.0.0 and less than 2.5.0. This vulnerability, rated Medium (CVSS 6.8), allows an attacker with low privileges to achieve high confidentiality and integrity impacts through a network-based attack with high attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.0, < 2.5.0CPE matchmatch criteria
cpe:2.3:a:sustainsys:saml2:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.2HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
5.8
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.20%
Probability of exploitation in next 30 days
EPSS Percentile
65.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0120 is in the 63rd percentile among its peer group of 1,425 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
nugetpatch availablevia ghsa
Product: Sustainsys.Saml2Fixed in: 2.5.0

Vendor Advisories (1)

nugetGHSA-g6j2-ch25-5mmvhigh

Missing Token Replay Detection in Saml2 Authentication services for ASP.NET

Mar 25, 2020

References

github.com / Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241
PatchThird Party Advisory
github.com / Sustainsys/Saml2/issues/711
Issue TrackingThird Party Advisory
github.com / Sustainsys/Saml2/security/advisories/GHSA-g6j2-ch25-5mmv
Third Party Advisory