VulnSocial

CVE-2026-8655Patch(citrix / netscaler_application_delivery_controller)

MEDIUMCVSS 9.8 · CRITICAL

Exploitation observed; activity peaked at 3 mentions and remains active

Immediate actions

  • Patch citrix netscaler_application_delivery_controller systems immediately
  • Assume compromise if assets are exposed

Recommended action window: Immediate (within 24h)

NVD description

Multiple Memory overflow vulnerabilities in NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if NetScaler ADC is configured as an LB of type Oracle OR NetScaler ADC is configured as a DNS Proxy OR NetScaler ADC is configured as a DNS recursive resolver deployment

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4.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-119

Priority

MEDIUM

Exploitation

ACTIVE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • netscaler_application_delivery_controller
  • netscaler_gateway

Threat summary

  • Active exploitation appears in 1 classified signals
  • Patch or workaround signal is available
  • 9 mentions across 6 observed days
  • Momentum state: stable

What's happening

  • Active exploitation reported across 1 signal
  • Patch or workaround mentioned in 6 signals
  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • Peaked 4d ago at 3 mentions (2026-07-01); latest day: 1
  • 9 total mentions across 6 days

Affected systems

Vendors
citrix
Products
netscaler_application_delivery_controllernetscaler_gateway

1 version affected across 2 products

Deep dive

Activity timeline9 mentions / 6d
01223Mentions · 2026-06-30: 1Mentions · 2026-07-01: 3Mentions · 2026-07-04: 2Mentions · 2026-07-08: 1Mentions · 2026-07-09: 1Mentions · 2026-07-25: 1Active Exploitation · 2026-07-01: 1Patch / Workaround · 2026-07-01: 2Patch / Workaround · 2026-07-04: 2Patch / Workaround · 2026-07-08: 1Patch / Workaround · 2026-07-25: 1Technical Details · 2026-07-01: 1Technical Details · 2026-07-04: 1Technical Details · 2026-07-08: 106-3007-0107-0407-0807-0907-25
Signal classification4 categories
Patch
555.6%
Disclosure
222.2%
Active Exploitation
111.1%
General
111.1%
Referenced assets8 URLs
Classification over time
DateTotalLabels
2026-06-301
Disclosure1
2026-07-013
Active Exploitation1Patch2
2026-07-042
Patch2
2026-07-081
Disclosure1
2026-07-091
General1
2026-07-251
Patch1
Full discourse9 posts
  • Autumn Good@autumn_good_35
    Patch

    🚨🚨🚨 NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-8451, CVE-2026-8452, CVE-2026-8655, CVE-2026-10816, CVE-2026-10817, and CVE-2026-13474 https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604

    Post summary

    The tweet announces Citrix’s Security Bulletin for several CVEs affecting NetScaler ADC and Gateway, directing readers to a support article for patch information, but it offers no technical or exploitation details.

    200511.6K
    7.0K followersView on X
  • Jan Tytgat 🇧🇪🇪🇺@jantytgat
    Disclosure

    🚨🚨🚨@cloudsoftware has just issued a security bulletin for @NetScaler 🚨🚨🚨 Severity: *** HIGH *** CVE: CVE-2026-8451 / CVE-2026-8452 / CVE-2026-8655 / CVE-2026-10816 / CVE-2026-10817 / CVE-2026-13474 For more information: https://mailinglist.corelayer.eu/archive/netscaler-security-bulletin-8936

    Post summary

    The tweet announces a security bulletin for NetScaler with several high‑severity CVEs, but provides no further technical details, PoCs, exploit code, or patch information.

    01010186
    910 followersView on X
  • iototsecnews@iototsecnews
    Disclosure

    Citrix NetScaler ADC／Gateway に 6件の脆弱性：メモリ範囲外読み取りと DoS 攻撃の恐れ https://iototsecnews.jp/2026/07/01/citrix-netscaler-adc-and-gateway-flaws-let-attackers-trigger-memory-overread-and-denial-of-service/ 今回の脆弱性は、入力値に対する不十分な検証や、メモリ処理におけるエラーなどが原因となって発生しています。 具体的には CVE-2026-8451／CVE-2026-10817 のようにメモリの範囲外読み取りを引き起こすものや、 CVE-2026-8452／CVE-2026-8655 のようにメモリオーバーフローを招くものがあります。また、認証なしで任意のファイルが読み取れてしまう CVE-2026-10816 や、不適切なメモリ処理によりリソースが枯渇する CVE-2026-13474 も存在します。 コンフィグやプロファイルが有効な場合に悪用される危険があるため、該当するシステムへの迅速なアップデートに加えて設定の変更が必要です。ご利用のチームは、ご注意ください。 #Citrix #NetScalerADC #Vulnerability

    Post summary

    The post announces six new Citrix NetScaler ADC/Gateway CVEs involving memory‑related vulnerabilities and urges users to apply updates and adjust configurations promptly.

    01000162
    500 followersView on X
  • IntegSec@integ_sec
    Patch

    CVE-2026-8655: NetScaler ADC Memory Overflow Vulnerabilities - What It Means for Your Business and How to Respond https://hubs.li/Q04qMsKJ0

    Post summary

    The article discusses the NetScaler ADC memory overflow vulnerabilities (CVE-2026-8655), outlining their potential business impact and providing guidance on how to patch or mitigate the risk.

    0000029
    32 followersView on X
  • CERT-PY@CERTpy
    General

    ⚠️ Vulnerabilidades en productos Citrix ❗ CVE-2026-8655 ❗ CVE-2026-8452 ❗ CVE-2026-8451 ➡️ Más info: https://www.cert.gov.py/vulnerabilidades-en-productos-citrix-4/ https://t.co/UwrkcXqHEb

    Post summary

    The tweet lists three new Citrix CVEs and links for additional information, but provides no technical or operational details.

    00000264
    6.7K followersView on X
  • Eyal Estrin ☁️@eyalestrin
    Patch

    NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-8451, CVE-2026-8452, CVE-2026-8655, CVE-2026-10816, CVE-2026-10817, and CVE-2026-13474 http://dlvr.it/TTM12f #patchmanagement

    Post summary

    The tweet announces a security bulletin for multiple CVEs with a link, indicating that vendor patches or mitigations are being released.

    0000056
    2.0K followersView on X
  • ByteSec1401 Efshagari@Leila97726926
    Patch

    Citrix has recently released new updates to fix NetScaler ADC and NetScaler Gateway, where attackers would be able to conduct file reads and/or trigger a Denial-of-Service condition. These updates resolves the following CVEs: -> CVE-2026-8451 -> CVE-2026-8452 -> CVE-2026-8655 -> CVE-2026-10816 -> CVE-2026-10817 -> CVE-2026-13474 Details can be found in the article below. #Cybersecurity #Ransomware #Citrix #CVE #Netscaler https://thehackernews.com/2026/07/citrix-patches-six-netscaler-flaws.html

    Post summary

    Citrix released patches for six NetScaler CVEs addressing file read and DoS vulnerabilities; no active exploitation or PoC disclosed.

    0000087
    321 followersView on X
  • VulDB 🛡@vuldb
    Active Exploitation

    Attention, elevated activities detected targeting Citrix NetScaler ADC and NetScaler Gateway (CVE-2026-8655) https://vuldb.com/vuln/374833/cti

    Post summary

    The message reports suspected active attacks targeting Citrix NetScaler products linked to CVE-2026-8655, but it provides no exploit details, patch information, or technical depth.

    00000107
    2.3K followersView on X
  • TECHEPAGES@techepages
    Patch

    🚨 6 high-severity Citrix NetScaler flaws - CVE-2026-8451 - CVE-2026-8452 - CVE-2026-8655 - CVE-2026-10816 - CVE-2026-10817 - CVE-2026-13474 All six stem from improper memory handling/input validation, enabling DoS and memory overflow. Fixes: - 14.1 → upgrade to 14.1-72.61+ - 13.1 → upgrade to 13.1-63.18+ - FIPS builds → upgrade to corresponding secure versions

    Post summary

    The post lists six high‑severity Citrix NetScaler CVEs caused by memory handling flaws that lead to DoS, and recommends specific software upgrades to patch them.

    0000073
    22 followersView on X
CPE platform detail5 entries

5 of 5 entries

PartVendorProductVersionTarget SWTarget HW
Appcitrixnetscaler_application_delivery_controller---
Appcitrixnetscaler_application_delivery_controller---
Appcitrixnetscaler_application_delivery_controller---
Appcitrixnetscaler_application_delivery_controller14.1-66.68--
Appcitrixnetscaler_gateway---

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