CVE-2020-8299· NVD / CVE Program· CNA hackerone

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

Noroxi assessment

Priority: Monitor (action score 26/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.41% (FIRST EPSS).
Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.5 · v3.1—No exploit No fix recorded

Published: Jun 16, 2021
Updated: Jun 16, 2026
EPSS: 0.4% · 34th percentile
CWE: CWE-400

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 26 / 40 · 6.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.4%

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
citrix	gateway	cpe:2.3:a:citrix:gateway
citrix	netscaler gateway	cpe:2.3:a:citrix:netscaler_gateway
citrix	application delivery controller firmware	cpe:2.3:o:citrix:application_delivery_controller_firmware
citrix	application delivery controller	cpe:2.3:h:citrix:application_delivery_controller
citrix	mpx\/sdx 14030 fips	cpe:2.3:h:citrix:mpx\/sdx_14030_fips
citrix	mpx\/sdx 14060 fips	cpe:2.3:h:citrix:mpx\/sdx_14060_fips
citrix	mpx\/sdx 14080 fips	cpe:2.3:h:citrix:mpx\/sdx_14080_fips
citrix	mpx 15030-50g fips	cpe:2.3:h:citrix:mpx_15030-50g_fips
citrix	mpx 15040-50g fips	cpe:2.3:h:citrix:mpx_15040-50g_fips
citrix	mpx 15060-50g fips	cpe:2.3:h:citrix:mpx_15060-50g_fips
citrix	mpx 15080-50g fips	cpe:2.3:h:citrix:mpx_15080-50g_fips
citrix	mpx 15100-50g fips	cpe:2.3:h:citrix:mpx_15100-50g_fips

and 5 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

citrix netscaler gateway11.1 and later · before 11.1-65.20

Versions reported by the vendor

Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.

n/a Citrix ADC, Citrix Gateway, Citrix SD-WAN WANOP Edition
- Fixed in Citrix ADC and Citrix Gateway 13.0-76.29 and later releases of 13.0, Citrix ADC and Citrix Gateway 12.1-61.18 and later releases of 12.1, Citrix ADC and NetScaler Gateway 11.1-65.20 and lateraffected

Same product

citrix: all records

Other highest-scoring records for the same primary product.

CVE-2023-24488Cross site scripting
48Plan
CVE-2022-27516User login brute force protection functionality bypass
39Monitor
CVE-2022-27510Unauthorized access to Gateway user capabilities
39Monitor

Published before and after this one in the same product

Later →CVE-2020-8300Jun 16, 2021 · 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 im
27Monitor
Later →CVE-2022-27509Jul 28, 2022 · Unauthenticated redirection to a malicious website
24Monitor
Later →CVE-2022-27513Nov 8, 2022 · Remote desktop takeover via phishing
38Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

Cloud Software GroupHackerOne · paid

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

Someone on the same network segment can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Adjacent
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {2  return node.children.map(expand);3}

Fixed

1const MAX_DEPTH = 32;2function expand(node, depth = 0) {3  if (depth > MAX_DEPTH) throw new Error("too deep");4  return node.children.map((c) => expand(c, depth + 1));5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

support.citrix.com/article/CTX297155

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records