CVE-2021-42555: Pexip Infinity before 26.2 allows temporary remote Denial of Service (abort) because of missing call-setup inp

This month

HIGH 7.5REMOTEUPGRADE

CVE-2021-42555 is a high-severity flaw (CVSS 7.5) affecting infinity. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Pexip Infinity before 26.2 allows temporary remote Denial of Service (abort) because of missing call-setup input validation.

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	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-20
Published	2022-01-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: pexip

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

Am I affected?

Timeline

2022-01-15 17:15 UTCPublished CVE record published
2026-06-17 04:09 UTCUpdated Record last modified

pexip infinity UPGRADE

Affected: >= 25.0 and < 26.2

Fixed in: 26.2

Safe to downgrade to: a release before 25.0

1. Check installed version

apt-cache policy infinity || rpm -q infinity || infinity --version

2. UPGRADE to 26.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade infinity

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade infinity

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 25.0 (Debian / Ubuntu)

apt-cache madison infinity sudo apt install infinity=<VERSION_BEFORE_25.0> sudo apt-mark hold infinity

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

dnf --showduplicates list infinity sudo dnf downgrade infinity-<VERSION_BEFORE_25.0> sudo dnf versionlock add infinity

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-2021-42555?

infinity: upgrade to 26.2. Exact commands for each OS are on this page.

Is CVE-2021-42555 being exploited?

CVE-2021-42555 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-2021-42555 affect?

CVE-2021-42555 affects infinity. Severity is high (CVSS 7.5). Pexip Infinity before 26.2 allows temporary remote Denial of Service (abort) because of missing call-setup input validation.

How urgent is CVE-2021-42555?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

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References

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