Threats / Citrix / CVE-2026-3055
CVE-2026-3055
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Citrix NetScaler vulnerability
Citrix NetScaler contains an out-of-bounds read vulnerability in SAML IDP configuration, enabling memory disclosure through crafted requests.
Verdict
Today item — known-exploited.
An out-of-bounds read in NetScaler SAML IDP processing allows unauthenticated attackers to leak sensitive memory contents. The high EPSS score and active exploitation reflect the ease of triggering memory disclosure on internet-facing deployments.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
93 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-03-30).
Probability (EPSS)
EPSS 0.83996 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Citrix, NetScaler. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-125 Out-of-bounds Read — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malformed SAML request to trigger an out-of-bounds read in the IDP parser.
Business
Sensitive data in server memory, including credentials and session tokens, becomes accessible to attackers without authentication.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I extract leaked memory contents to identify authentication secrets or encryption keys.
Business
Compromised credentials enable lateral movement and unauthorized access to protected resources and downstream systems.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05