How severe is CVE-2020-8300?

CVE-2020-8300 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-8300 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8300?

CVE-2020-8300 primarily affects Citrix Gateway. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-8300?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-8300 published?

CVE-2020-8300 was published on 2021-06-16 and last updated on 2026-06-17.

CVE-2020-8300

CVE-2020-8300 is a medium-severity vulnerability in Citrix Gateway with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Citrix Gateway
Published: 2021-06-16
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2020-8300?: CVE-2020-8300 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-8300 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8300?: CVE-2020-8300 primarily affects Citrix Gateway. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-8300?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-8300 published?: CVE-2020-8300 was published on 2021-06-16 and last updated on 2026-06-17.

References

https://support.citrix.com/article/CTX297155

Affected products (3)

cpe:2.3:a:citrix:gateway:*:*:*:*:*:*:*:*
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Citrix Gateway

CVE-2022-27510 — Critical (CVSS 9.8): Unauthorized access to Gateway user capabilities
CVE-2020-8247 — High (CVSS 8.8): Citrix ADC and Citrix Gateway 13.0 before 13.0-64.35, Citrix ADC and NetScaler Gateway 12.1 before 12.1-58.15, Citrix…
CVE-2022-27513 — High (CVSS 8.3): Remote desktop takeover via phishing
CVE-2021-22927 — High (CVSS 8.1): A session fixation vulnerability exists in Citrix ADC and Citrix Gateway 13.0-82.45 when configured SAML service…
CVE-2022-27508 — High (CVSS 7.5): Unauthenticated denial of service
CVE-2021-22956 — High (CVSS 7.5): An uncontrolled resource consumption vulnerability exists in Citrix ADC <13.0-83.27, <12.1-63.22 and 11.1-65.23 that…

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