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Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability

Exploited · KEV 2025-07-10RansomwarePublic exploit codeCVE-2025-5777CWE-125

Exploited since 2025-07-10. 2 of 8 rule sources name it. Our CRS test: not blocked.

Edge rules
2/8
Our test
Not blocked
CVSS
9.3
EPSS
100.0% Top 0.1%
Posts, 14d
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Published
2025-06-17

Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

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Ask about CVE-2025-5777: who's covered, what to patch first, how vendors compare. I cite sources and won't help with attacks.

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Severity, decoded

CVSS 4.0
Critical · 9.3 / 10

Exploitable over the network, with no privileges and no user interaction, leading to full loss of confidentiality, integrity and availability; other systems can also be hit (low impact on confidentiality, integrity and availability).

Over the internetNo login neededNo user actionWorks reliablyFull compromise
How the score is built11 metrics
  • Attack vectorAn attacker can reach it over the internet; no access to your network needed.
    Network
  • Attack complexityNo built-in defences have to be bypassed; the attack works reliably.
    Low
  • Attack requirementsThe attack works without any special deployment or timing conditions.
    None
  • Privileges requiredNo account or login is needed.
    None
  • User interactionNo one has to click or open anything; the attack works on its own.
    None
  • Confidentiality impact (vulnerable system)An attacker can read all data the affected component holds, or the most sensitive parts of it.
    High
  • Integrity impact (vulnerable system)An attacker can change any data or files the affected component protects.
    High
  • Availability impact (vulnerable system)An attacker can take the component down completely or keep it from serving anyone.
    High
  • Confidentiality impact (other systems)Other systems that rely on it can have some data read.
    Low
  • Integrity impact (other systems)Other systems that rely on it can have some data changed.
    Low
  • Availability impact (other systems)Other systems that rely on it can be slowed down or interrupted.
    Low
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
CISA's assessmentSSVC, from the CVE record
ExploitationActive

Attackers are exploiting this in the wild.

AutomatableYes

Attackers can script the attack end to end and hit many targets at once.

Technical impactTotal

A successful attack gives full control over the affected software or all of its data.

Public exploits

2 found
0 Metasploit1 Exploit-DB1 Scanner template0 GitHub PoCs

Links are to third-party code: never run it outside an isolated lab.

Timeline

  1. 2025-06-17
    CVE published
    CVE List
  2. 2025-07-10
    Added to CISA KEV
    Confirmed exploitation in the wild
  3. 2025-07-21
    Cloudflare ships a rule
    Citrix Netscaler ADC - Buffer Error - CVE:CVE-2025-5777
  4. 2025-08-11
    Exploit published on Exploit-DB
    Citrix NetScaler ADC/Gateway 14.1 - Memory Disclosure
  5. 2025-08-15
    F5 ships a rule
    Citrix NetScaler Information Disclosure
  6. 2026-11-02
    Our test: OWASP Core Rule Set let it through
    paranoia level 1, anomaly threshold 5, default CRS settings
  7. 2026-11-02
    Our test: OWASP Core Rule Set let it through
    paranoia level 2, anomaly threshold 5, default CRS settings

Social

2026-10-21: 0 posts2026-10-22: 0 posts2026-10-23: 0 posts2026-10-24: 0 posts2026-10-25: 0 posts2026-10-26: 0 posts2026-10-27: 0 posts2026-10-28: 0 posts2026-10-29: 0 posts2026-10-30: 0 posts2026-10-31: 0 posts2026-11-01: 0 posts2026-11-02: 0 posts2026-11-03: 0 posts

No posts seen yet on X, Bluesky, Mastodon, Hacker News or GitHub.

Vendor statements

Quoted
CloudflareWAF Managed Rules1 quoteRule off by default

First rule 2025-07-21, 34 days after the CVE was published.

2025-07-21New rule…7899130fDefault: DisabledSource
Citrix Netscaler ADC - Buffer Error - CVE:CVE-2025-5777. Previous action: Log. New action: Disabled. This is a New Detection
AWSAWS WAF Managed RulesNo public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. AWS often describes a vulnerability without naming its CVE (for example "Log4j"). We count only entries that name the CVE, so AWS coverage is understated.

Microsoft AzureFront Door and Application Gateway WAF (DRS)No public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. The rule tables name CVEs but carry no dates, so Azure is left out of every time-to-rule figure.

Google CloudCloud Armor preconfigured WAF rulesNo public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. Google names few CVEs: the release notes start in May 2024 and the rules reference lists CVEs without dates. Its cve-canary rules are opt-in.

FastlyNext-Gen WAF virtual patchesBefore feed history

The CVE predates the oldest entry in this vendor's public feed, so a rule may exist that we cannot see.

F5Attack signatures (Distributed Cloud WAF)1 quoteRule published

First rule 2025-08-15, 59 days after the CVE was published.

2025-08-15New rule200009336Source
Added: signature 200009336 "Citrix NetScaler Information Disclosure" (Information Leakage, risk High), systems: Citrix. References: CVE-2025-5777.
AkamaiApp & API Protector (Adaptive Security Engine)No public source

This vendor publishes no machine-readable rule changelog we can check.

OWASP CRSCore Rule Set (open source, used inside many WAFs)No public claim

We found no public statement from this vendor naming this CVE. That is not proof of no protection: generic rules may still catch it. CRS rarely names CVEs: it relies on generic detections. Our own lab measures what it actually blocks.