How severe is CVE-2021-25689?

CVE-2021-25689 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-25689 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25689?

CVE-2021-25689 primarily affects Teradici Pcoip Soft Client. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-25689?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-25689 published?

CVE-2021-25689 was published on 2021-02-11 and last updated on 2026-06-17.

CVE-2021-25689

CVE-2021-25689 is a critical-severity vulnerability in Teradici Pcoip Soft Client with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Teradici Pcoip Soft Client
Published: 2021-02-11
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-25689?: CVE-2021-25689 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-25689 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25689?: CVE-2021-25689 primarily affects Teradici Pcoip Soft Client. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-25689?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-25689 published?: CVE-2021-25689 was published on 2021-02-11 and last updated on 2026-06-17.

References

https://advisory.teradici.com/security-advisories/75/

Affected products (3)

cpe:2.3:a:teradici:pcoip_soft_client:*:*:*:*:*:linux:*:*
cpe:2.3:a:teradici:pcoip_soft_client:*:*:*:*:*:macos:*:*
cpe:2.3:a:teradici:pcoip_soft_client:*:*:*:*:*:windows:*:*

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