CVE-2021-25693: An attacker may cause a Denial of Service (DoS) in multiple versions of Teradici PCoIP Agent via a null pointe

This month

HIGH 7.5REMOTEUPGRADE

CVE-2021-25693 is a high-severity flaw (CVSS 7.5) affecting pcoip agent. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An attacker may cause a Denial of Service (DoS) in multiple versions of Teradici PCoIP Agent via a null pointer dereference.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-476
Published	2021-05-13
Last modified	2026-06-17

Publisher (CNA): Teradici Corporation · Vendor: teradici

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-05-13 14:15 UTCPublished CVE record published
2026-06-17 03:42 UTCUpdated Record last modified

teradici pcoip agent UPGRADE

Affected: >= 20.10 and < 20.10.6 · >= 21.01 and < 21.01.5 · >= 21.03 and < 21.03.1

Fixed in: 20.10.6, 21.01.5, 21.03.1

Safe to downgrade to: a release before 20.10

1. Check installed version

apt-cache policy pcoip-agent || rpm -q pcoip-agent || pcoip-agent --version

2. UPGRADE to 20.10.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pcoip-agent

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pcoip-agent

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 20.10 (Debian / Ubuntu)

apt-cache madison pcoip-agent sudo apt install pcoip-agent=<VERSION_BEFORE_20.10> sudo apt-mark hold pcoip-agent

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list pcoip-agent sudo dnf downgrade pcoip-agent-<VERSION_BEFORE_20.10> sudo dnf versionlock add pcoip-agent

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-25693?

pcoip agent: upgrade to 20.10.6, 21.01.5, 21.03.1. Exact commands for each OS are on this page.

Is CVE-2021-25693 being exploited?

CVE-2021-25693 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-25693 affect?

CVE-2021-25693 affects pcoip agent. Severity is high (CVSS 7.5). An attacker may cause a Denial of Service (DoS) in multiple versions of Teradici PCoIP Agent via a null pointer dereference.

How urgent is CVE-2021-25693?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

References

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