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CVE-2020-8300: Citrix ADC and Citrix/NetScaler Gateway before 13.0-82.41, 12.1-62.23, 11.1-65.20 and Citrix ADC 12.1-FIPS bef

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MEDIUM 6.5UPGRADEUPGRADEUPGRADE

CVE-2020-8300 is a medium-severity flaw (CVSS 6.5) affecting gateway, netscaler gateway, application delivery controller firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Citrix ADC and Citrix/NetScaler Gateway before 13.0-82.41, 12.1-62.23, 11.1-65.20 and Citrix ADC 12.1-FIPS before 12.1-55.238 suffer from improper access control allowing SAML authentication hijack through a phishing attack to steal a valid user session. Note that Citrix ADC or Citrix Gateway must be configured as a SAML SP or a SAML IdP for this to be possible.

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionRequired
EPSS exploit chance3.0% (top 13%)
CISA exploited listNo
WeaknessCWE-284
Published2021-06-16
Last modified2026-06-17
Publisher (CNA): HackerOne · 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 gateway UPGRADE
Affected: >= 12.1 and < 12.1-62.23 · >= 13.0 and < 13.0-82.41
Fixed in: 12.1-62.23, 13.0-82.41
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 12.1-62.23 (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 netscaler gateway UPGRADE
Affected: >= 11.1 and < 11.1-65.20
Fixed in: 11.1-65.20
Safe to downgrade to: a release before 11.1
1. Check installed version
apt-cache policy netscaler-gateway || rpm -q netscaler-gateway || netscaler-gateway --version
2. UPGRADE to 11.1-65.20 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade netscaler-gateway
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade netscaler-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 11.1 (Debian / Ubuntu)
apt-cache madison netscaler-gateway sudo apt install netscaler-gateway=<VERSION_BEFORE_11.1> sudo apt-mark hold netscaler-gateway
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list netscaler-gateway sudo dnf downgrade netscaler-gateway-<VERSION_BEFORE_11.1> sudo dnf versionlock add netscaler-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: >= 11.1 and < 11.1-65.20 · >= 12.1 and < 12.1-62.23 · >= 13.0 and < 13.0-82.41 · >= 12.1 and < 12.1-55.238
Fixed in: 11.1-65.20, 12.1-55.238, 12.1-62.23, 13.0-82.41
Safe to downgrade to: a release before 11.1
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-2020-8300?

gateway: upgrade to 12.1-62.23, 13.0-82.41; netscaler gateway: upgrade to 11.1-65.20; application delivery controller firmware: upgrade to 11.1-65.20, 12.1-55.238, 12.1-62.23, 13.0-82.41. Exact commands for each OS are on this page.

Is CVE-2020-8300 being exploited?

CVE-2020-8300 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-2020-8300 affect?

CVE-2020-8300 affects gateway, netscaler gateway, application delivery controller firmware. Severity is medium (CVSS 6.5). Citrix ADC and Citrix/NetScaler Gateway before 13.0-82.41, 12.1-62.23, 11.1-65.20 and Citrix ADC 12.1-FIPS before 12.1-55.238 suffer from improper access control allowing SAML authentication hijack through a phishing attack to steal a valid

How urgent is CVE-2020-8300?

Priority 45/100. No elevated risk signals yet.

Software pages

Citrix vulnerabilities

Related CVEs

References

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