CVE-2020-8299

Citrix ADC and Citrix/NetScaler Gateway 13.0 before 13.0-76.29, 12.1-61.18, 11.1-65.20, Citrix ADC 12.1-FIPS before 12.1-55.238, and Citrix SD-WAN WANOP Edition before 11.4.0, 11.3.2, 11.3.1a, 11.2.3a, 11.1.2c, 10.2.9a suffers from uncontrolled resource consumption by way of a network-based denial-of-service from within the same Layer 2 network segment. Note that the attacker must be in the same Layer 2 network segment as the vulnerable appliance.

Published: 2021-06-16 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-8299 is rated Low Risk (37.7/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.42%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-8299

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.32% 0.42% +0.10%
2 2026-05-14 0.25% 0.32% +0.07%
3 2025-11-21 — 0.25% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8299

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
3.3 2.0 LOW
AV:A/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.5 2.9 [email protected]

Weakness enumeration for CVE-2020-8299

Affected software / configurations for CVE-2020-8299

Vendor Product Version Raw CPE
citrix gateway >= 12.1, < 12.1-61.18 cpe:2.3:a:citrix:gateway:*:*:*:*:*:*:*:*
citrix gateway >= 13.0, < 13.0-76.29 cpe:2.3:a:citrix:gateway:*:*:*:*:*:*:*:*
citrix netscaler_gateway >= 11.1, < 11.1-65.20 cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
citrix application_delivery_controller_firmware >= 11.1, < 11.1-65.20 cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
citrix application_delivery_controller_firmware >= 12.1, < 12.1-61.18 cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
citrix application_delivery_controller_firmware >= 13.0, < 13.0-76.29 cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
citrix application_delivery_controller_firmware >= 12.1, < 12.1-55.238 cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
citrix sd-wan_wanop >= 10.2, < 10.2.9a cpe:2.3:o:citrix:sd-wan_wanop:*:*:*:*:*:*:*:*
citrix sd-wan_wanop >= 11.1, < 11.1.2c cpe:2.3:o:citrix:sd-wan_wanop:*:*:*:*:*:*:*:*
citrix sd-wan_wanop >= 11.2, < 11.2.3a cpe:2.3:o:citrix:sd-wan_wanop:*:*:*:*:*:*:*:*
citrix sd-wan_wanop >= 11.3, < 11.3.2 cpe:2.3:o:citrix:sd-wan_wanop:*:*:*:*:*:*:*:*

References for CVE-2020-8299

cvelogic Threat Intelligence