CVE-2021-40532

Name: CVE-2021-40532
Creator: NVD / NIST
Published: 2021-09-06T21:15:07.413+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.08%

Last modified Jun 17, 2026

CVE-2021-40532 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Telegram Web K Alpha before 0.7.2 mishandles the characters in a document extension.. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

Description

Telegram Web K Alpha before 0.7.2 mishandles the characters in a document extension.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.08%

60.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Telegram	Web K Alpha	< 0.7.2

References

https://github.com/morethanwords/tweb/commit/f224e459c36eb96b2cf9dba559a48b1f08d23330Patch, Third Party Advisory
https://github.com/morethanwords/tweb/commit/f224e459c36eb96b2cf9dba559a48b1f08d23330Patch, Third Party Advisory

Timeline

Published: Sep 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40532?

Telegram Web K Alpha before 0.7.2 mishandles the characters in a document extension.

How severe is CVE-2021-40532?

CVE-2021-40532 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40532?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40532?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST