What is CVE-2021-1725?

CVE-2021-1725 is a medium-severity vulnerability in Microsoft Bot Framework Sdk For JavaScript, classified under Improper Authentication. CVSS score: 5.5/10. Published 2021-01-12.

How severe is CVE-2021-1725?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Auth bypass in Microsoft Bot Framework Sdk For JavaScript

CVE-2021-1725

Bot Framework SDK Information Disclosure Vulnerability

Vulnerability class: Broken Authentication

Published 2021-01-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.3th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Microsoft Bot Framework Sdk For JavaScript — versions 4.0.0
Microsoft Bot Framework Sdk For .Net — versions 4.0.0
Microsoft Bot Framework Sdk For Python — versions 4.0.0
Microsoft Bot Framework Software Development Kit

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1725 (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2021-1725?: CVE-2021-1725 is a medium-severity vulnerability in Microsoft Bot Framework Sdk For JavaScript, classified under Improper Authentication. CVSS score: 5.5/10. Published 2021-01-12.
How severe is CVE-2021-1725?: Medium severity. CVSS v3 base score is 5.5 out of 10.