What is CVE-2021-25689?

CVE-2021-25689 is a critical-severity vulnerability in Teradici Pcoip Soft Client, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-02-11.

How severe is CVE-2021-25689?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Teradici Pcoip Soft Client

CVE-2021-25689

An out of bounds write in Teradici PCoIP soft client versions prior to version 20.10.1 could allow an attacker to remotely execute code.

Vulnerability class: Buffer Overflow

Published 2021-02-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.1% 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: 0.016 · change: +0.001

Affected products

Teradici Pcoip Soft Client
- Pcoip Soft Client For Windows Linux Osx — versions 20.10.0 and earlier

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

advisory.teradici.com/security-advisories/75/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-25689?: CVE-2021-25689 is a critical-severity vulnerability in Teradici Pcoip Soft Client, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-02-11.
How severe is CVE-2021-25689?: Critical severity. CVSS v3 base score is 9.8 out of 10.