Vulnerability in Sustainsys Saml2
CVE-2020-5261
Saml2 Authentication services for ASP.NET (NuGet package Sustainsys.Saml2) greater than 2.0.0, and less than version 2.5.0 has a faulty implementation of Token Replay Detection. Token Replay Detection is an important defence in depth measure for Single Sign On solutions. The 2.5.0 version is patched. Note that version 1.0.1 is not affected. It has a correct Token Replay Implementation and is safe to use. Saml2 Authentication services for ASP.NET (NuGet package Sustainsys.Saml2) greater than 2.0.0, and less than version 2.5.0 have a faulty implementation of Token Replay Detection. Token Replay Detection is an important defense measure for Single Sign On solutions. The 2.5.0 version is patched. Note that version 1.0.1 and prior versions are not affected. These versions have a correct Token Replay Implementation and are safe to use.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.015 (73.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Sustainsys Saml2 — versions >= 2.0.0, < 2.5.0
Weakness classification (CWE)
References
- github.com/Sustainsys/Saml2/security/advisories/GHSA-g6j2-ch25-5mmv (Third Party Advisory)
- github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241 (Patch, Third Party Advisory)
- github.com/Sustainsys/Saml2/issues/711 (Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2020-5261?
- CVE-2020-5261 is a high-severity vulnerability in Sustainsys Saml2, classified under Authentication Bypass by Capture-replay. CVSS score: 8.2/10. Published 2020-03-25.
- How severe is CVE-2020-5261?
- High severity. CVSS v3 base score is 8.2 out of 10.