CVE-2022-27516: User login brute force protection functionality bypass

Q: How do I fix CVE-2022-27516?

gateway: upgrade to 12.1-65.21, 13.0-88.12, 13.1-33.47; application delivery controller firmware: upgrade to 12.1-55.289, 12.1-65.21, 13.0-88.12, 13.1-33.47. Exact commands for each OS are on this page.

Q: Is CVE-2022-27516 being exploited?

CVE-2022-27516 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-27516 affect?

CVE-2022-27516 affects gateway, application delivery controller firmware. Severity is medium (CVSS 5.3). User login brute force protection functionality bypass

Q: How urgent is CVE-2022-27516?

Priority 36/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADEUPGRADE

CVE-2022-27516 is a medium-severity flaw (CVSS 5.3) affecting gateway, application delivery controller firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

User login brute force protection functionality bypass

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-693, CWE-307
Published	2022-11-08
Last modified	2026-06-17

Publisher (CNA): Citrix Systems, Inc. · Vendor: citrix

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

Am I affected?

Timeline

2022-11-08 22:15 UTCPublished CVE record published
2026-06-17 04:37 UTCUpdated Record last modified

citrix gateway UPGRADE

Affected: >= 12.1 and < 12.1-65.21 · >= 13.0 and < 13.0-88.12 · >= 13.1 and < 13.1-33.47

Fixed in: 12.1-65.21, 13.0-88.12, 13.1-33.47

Safe to downgrade to: a release before 12.1

1. Check installed version

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

2. UPGRADE to 12.1-65.21 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gateway

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 12.1 (Debian / Ubuntu)

apt-cache madison gateway sudo apt install gateway=<VERSION_BEFORE_12.1> sudo apt-mark hold gateway

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

dnf --showduplicates list gateway sudo dnf downgrade gateway-<VERSION_BEFORE_12.1> 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.

citrix application delivery controller firmware UPGRADE

Affected: >= 12.1 and < 12.1-65.21 · >= 13.0 and < 13.0-88.12 · >= 13.1 and < 13.1-33.47 · >= 12.1 and < 12.1-55.289

Fixed in: 12.1-55.289, 12.1-65.21, 13.0-88.12, 13.1-33.47

Safe to downgrade to: a release before 12.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2022-27516?

gateway: upgrade to 12.1-65.21, 13.0-88.12, 13.1-33.47; application delivery controller firmware: upgrade to 12.1-55.289, 12.1-65.21, 13.0-88.12, 13.1-33.47. Exact commands for each OS are on this page.

Is CVE-2022-27516 being exploited?

CVE-2022-27516 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-2022-27516 affect?

CVE-2022-27516 affects gateway, application delivery controller firmware. Severity is medium (CVSS 5.3). User login brute force protection functionality bypass

How urgent is CVE-2022-27516?

Priority 36/100. Remotely exploitable, no login, no user action

Software pages

Citrix vulnerabilities

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References

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