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CVE-2022-27508: Unauthenticated denial of service

47
This month
HIGH 7.5REMOTEDOWNGRADEDOWNGRADE

CVE-2022-27508 is a high-severity flaw (CVSS 7.5) affecting application delivery controller, gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unauthenticated denial of service

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance1.0% (top 37%)
CISA exploited listNo
WeaknessCWE-400
Published2023-01-26
Last modified2026-06-17
Publisher (CNA): Citrix Systems, Inc. · Vendor: citrix

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

Am I affected?

Timeline

citrix application delivery controller DOWNGRADE
Affected: 12.1-64.16
Fixed in: no fixed release known
Safe to downgrade to: a release before 12.1-64.16
1. Check installed version
apt-cache policy application-delivery-controller || rpm -q application-delivery-controller || application-delivery-controller --version
2. No fixed release: DOWNGRADE to a release before 12.1-64.16 (Debian / Ubuntu)
apt-cache madison application-delivery-controller sudo apt install application-delivery-controller=<VERSION_BEFORE_12.1-64.16> sudo apt-mark hold application-delivery-controller
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list application-delivery-controller sudo dnf downgrade application-delivery-controller-<VERSION_BEFORE_12.1-64.16> sudo dnf versionlock add application-delivery-controller
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.
citrix gateway DOWNGRADE
Affected: 12.1-64.16
Fixed in: no fixed release known
Safe to downgrade to: a release before 12.1-64.16
1. Check installed version
apt-cache policy gateway || rpm -q gateway || gateway --version
2. No fixed release: DOWNGRADE to a release before 12.1-64.16 (Debian / Ubuntu)
apt-cache madison gateway sudo apt install gateway=<VERSION_BEFORE_12.1-64.16> sudo apt-mark hold gateway
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list gateway sudo dnf downgrade gateway-<VERSION_BEFORE_12.1-64.16> sudo dnf versionlock add gateway
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-2022-27508?

application delivery controller: downgrade or apply the listed mitigation; gateway: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-27508 being exploited?

CVE-2022-27508 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-2022-27508 affect?

CVE-2022-27508 affects application delivery controller, gateway. Severity is high (CVSS 7.5). Unauthenticated denial of service

How urgent is CVE-2022-27508?

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

Software pages

Citrix vulnerabilities

Related CVEs

References

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