CVE-2026-3055Known exploitationPublic exploitNetwork attack vector

Unauthenticated memory disclosure via missing SAML fields

Published Mar 23, 2026 · Updated Mar 23, 2026

Out-of-bounds reads in Citrix NetScaler ADC and NetScaler Gateway allow remote attackers to disclose appliance memory through SAML endpoints. The /saml/login handler serializes an omitted AssertionConsumerServiceURL, while /wsfed/passive accepts a valueless wctx and places stale memory in NSC_TASS cookies. Exploitation is unauthenticated but requires a customer-managed appliance configured as a SAML IdP; exposed memory can contain session cookies and credentials.

CVSS severity9.3
Critical
EPSS probability87.17%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds reads in Citrix NetScaler ADC and NetScaler Gateway allow remote attackers to disclose appliance memory through SAML endpoints. The /saml/login handler serializes an omitted AssertionConsumerServiceURL, while /wsfed/passive accepts a valueless wctx and places stale memory in NSC_TASS cookies. Exploitation is unauthenticated but requires a customer-managed appliance configured as a SAML IdP; exposed memory can contain session cookies and credentials.

The record

CVE
CVE-2026-3055
Published
Mar 23, 2026
Updated
Mar 23, 2026
Vendor
Cloud Software Group
Product
NetScaler Gateway
Classifications
CWE-125, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 23, 2026Record updatedLatest update available in the CVE record.
  3. Mar 27, 2026Exploitation reportedwatchTowr honeypot exploitation observation
  4. Mar 30, 2026Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=13.1 <62.23
  2. Affected versionversion=14.1 <66.59

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloud Software Group · NetScaler Gatewayversion=13.1 <62.23; version=14.1 <66.59
Cloud Software Group · NetScaler ADCversion=13.1 <62.23; version=13.1 FIPS and NDcPP <37.262; version=14.1 <66.59

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3NetScalerCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsShadowserver observations through Sep 16, 2026. Gaps indicate unavailable data.
Sep 10, 2026Sep 16, 2026
View daily counts
Reporting dayUnique IPs
Sep 10, 202618
Sep 11, 202635
Sep 12, 202629
Sep 13, 20263
Sep 14, 202623
Sep 15, 20266
Sep 16, 202611
Latest reporting daySep 16, 2026
Latest daily unique IPs11
Prior 30-day average20.3
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

See the directory against your own environment.

Your stack

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