Cisco and Citrix 0-Days Actively Exploited in the Wild

Recent cybersecurity reports reveal active exploitation of zero-day vulnerabilities in Cisco and Citrix products. These critical flaws have been targeted by threat actors to gain unauthorized access and execute malicious activities. Cisco's vulnerability affects its networking devices, while Citrix's flaw impacts its ADC and Gateway products, widely used in enterprise environments. Both companies have released security advisories urging immediate patching to mitigate risks. The exploitation involves sophisticated attack techniques, highlighting the importance of timely updates and robust security measures. Organizations using these products should prioritize vulnerability management and monitor for unusual activities to prevent potential breaches. This incident underscores the evolving threat landscape and the need for continuous vigilance in cybersecurity practices.

This Cyber News was published on cybersecuritynews.com. Publication date: Wed, 12 Nov 2025 14:25:21 +0000


Cyber News related to Cisco and Citrix 0-Days Actively Exploited in the Wild

CVE-2007-2850 - The Session Reliability Service (XTE) in Citrix MetaFrame Presentation Server 3.0, Presentation Server 4.0, and Access Essentials 1.0 and 1.5, allows remote attackers to bypass network security policies and connect to arbitrary TCP ports via a ...
8 years ago
Check Point released hotfix for actively exploited VPN zero-day - MUST READ. Check Point released hotfix for actively exploited VPN zero-day. Microsoft Patch Tuesday security updates for May 2024 fixes 2 actively exploited zero-days. Critical Fortinet's FortiClient EMS flaw actively exploited in the wild. Apple ...
1 year ago Securityaffairs.com CVE-2024-23222 CVE-2023-22515 CVE-2023-40044 CVE-2023-20109
New MOVEit Transfer critical bug is actively exploited - MUST READ. New MOVEit Transfer critical bug is actively exploited. CISA adds Microsoft SharePoint bug disclosed at Pwn2Own to its Known Exploited Vulnerabilities catalog. Critical Fortinet's FortiClient EMS flaw actively exploited in the wild. PoC ...
1 year ago Securityaffairs.com CVE-2020-3259 CVE-2023-22515 CVE-2023-40044 CVE-2023-20109 Rocke
US Health Dept urges hospitals to patch critical Citrix Bleed bug - The U.S. Department of Health and Human Services warned hospitals this week to patch the critical 'Citrix Bleed' Netscaler vulnerability actively exploited in attacks. Ransomware gangs are already using Citrix Bleed to breach their targets' networks ...
1 year ago Bleepingcomputer.com CVE-2023-4966 LockBit
LockBit ransomware exploits Citrix Bleed in attacks, 10K servers exposed - The Lockbit ransomware attacks use publicly available exploits for the Citrix Bleed vulnerability to breach the systems of large organizations, steal data, and encrypt files. Although Citrix made fixes available for CVE-2023-4966 more than a month ...
1 year ago Bleepingcomputer.com CVE-2023-4966 LockBit
Over 1,200 Citrix servers unpatched against critical auth bypass flaw - While Citrix has yet to confirm that this security flaw is being exploited in the wild, saying that "currently, there is no evidence to suggest exploitation of CVE-2025-5777," cybersecurity firm ReliaQuest reported on Thursday with medium confidence ...
4 months ago Bleepingcomputer.com CVE-2025-5777
Two more Citrix NetScaler bugs exploited in the wild The Register - Two vulnerabilities in NetScaler's ADC and Gateway products have been fixed - but not before criminals found and exploited them, according to the vendor. CVE-2023-6548 could allow remote code execution in the appliances' management interface. It ...
1 year ago Go.theregister.com CVE-2023-6548 CVE-2023-6549
HHS warns of 'Citrix Bleed' attacks after hospital outages - The U.S. Department of Health and Human Services is warning hospitals and healthcare facilities across the country to patch a vulnerability known as "Citrix Bleed" that is being used in attacks by ransomware gangs. For weeks, cybersecurity experts ...
1 year ago Therecord.media CVE-2023-4966 LockBit
Citrix warns admins to kill NetScaler user sessions to block hackers - Citrix reminded admins today that they must take additional measures after patching their NetScaler appliances against the CVE-2023-4966 'Citrix Bleed' vulnerability to secure vulnerable devices against attacks. Besides applying the necessary ...
1 year ago Bleepingcomputer.com CVE-2023-4966 LockBit
Citrix Bleed 2 exploited weeks before PoCs as Citrix denied attacks - Security researcher Kevin Beaumont has previously stated that repeated POST requests to /doAuthentication.do in NetScaler logs is a good indication that someone is attempting to exploit the flaw, especially when the request includes a Content-Length: ...
3 months ago Bleepingcomputer.com CVE-2025-5777
Sav-Rx data breach impacted over 2.8 million individuals - Microsoft Patch Tuesday security updates for May 2024 fixes 2 actively exploited zero-days. Nation-state actors exploited two zero-days in ASA and FTD firewalls to breach government networks. Microsoft fixed two zero-day bugs exploited in malware ...
1 year ago Securityaffairs.com CVE-2020-3259 CVE-2023-22515 APT29 BianLian
Cisco patches IOS XE zero-days used to hack over 50,000 devices - Cisco has addressed the two vulnerabilities that hackers exploited to compromise tens of thousands of IOS XE devices over the past week. The free software release comes after a threat actor leveraged the security issues as zero-days to compromise and ...
1 year ago Bleepingcomputer.com CVE-2023-20198
Cisco discloses new IOS XE zero-day exploited to deploy malware implant - Cisco disclosed a new high-severity zero-day today, actively exploited to deploy malicious implants on IOS XE devices compromised using the CVE-2023-20198 zero-day unveiled earlier this week. The company said it found a fix for both vulnerabilities ...
1 year ago Bleepingcomputer.com CVE-2023-20198 CVE-2023-20273 CVE-2021-1435
newsletter Round 473 by Pierluigi Paganini - Microsoft Patch Tuesday security updates for May 2024 fixes 2 actively exploited zero-days. Microsoft fixed two zero-day bugs exploited in malware attacks. HTTP/2 CONTINUATION Flood technique can be exploited in DoS attacks. BianLian group exploits ...
1 year ago Securityaffairs.com CVE-2020-3259 CVE-2023-46747 CVE-2023-46748 CVE-2023-22515 APT29 Rocke BianLian
Critical Citrix Bleed 2 flaw now likely exploited in attacks - "While no public exploitation of CVE-2025-5777, dubbed "Citrix Bleed 2," has been reported, ReliaQuest assesses with medium confidence that attackers are actively exploiting this vulnerability to gain initial access to targeted environments," warns ...
4 months ago Bleepingcomputer.com CVE-2025-5777
Citrix Bleed 2 flaw now believed to be exploited in attacks - "While no public exploitation of CVE-2025-5777, dubbed "Citrix Bleed 2," has been reported, ReliaQuest assesses with medium confidence that attackers are actively exploiting this vulnerability to gain initial access to targeted environments," warns ...
4 months ago Bleepingcomputer.com CVE-2025-5777
CISA orders agencies to immediately patch Citrix Bleed 2, saying bug poses ‘unacceptable risk’ | The Record from Recorded Future News - The bug affects Citrix Netscaler ADC and Netscaler Gateway appliances and the company said exploitation of the vulnerability “on unmitigated appliances have been observed.” Since that advisory, multiple incident responders have warned that the ...
4 months ago Therecord.media CVE-2025-5777
CISA pushes federal agencies to patch Citrix RCE within a week - Today, CISA ordered U.S. federal agencies to secure their systems against three recently patched Citrix NetScaler and Google Chrome zero-days actively exploited in attacks, pushing for a Citrix RCE bug to be patched within a week. Citrix urged ...
1 year ago Bleepingcomputer.com CVE-2023-6548 CVE-2023-6549 CVE-2024-0519
Healthcare firm WebTPA data breach impacted 2.5M individuals - Microsoft Patch Tuesday security updates for May 2024 fixes 2 actively exploited zero-days. CISA adds GitLab flaw to its Known Exploited Vulnerabilities catalog. Nation-state actors exploited two zero-days in ASA and FTD firewalls to breach ...
1 year ago Securityaffairs.com CVE-2020-3259 CVE-2023-22515 APT29 BianLian
Citrix Bleed exploit lets hackers hijack NetScaler accounts - A proof-of-concept exploit is released for the 'Citrix Bleed' vulnerability, tracked as CVE-2023-4966, that allows attackers to retrieve authentication session cookies from vulnerable Citrix NetScaler ADC and NetScaler Gateway appliances. ...
1 year ago Bleepingcomputer.com CVE-2023-4966
Impact of Remote Work and Cloud Migrations on Security Perimeters - Microsoft Patch Tuesday security updates for May 2024 fixes 2 actively exploited zero-days. Microsoft fixed two zero-day bugs exploited in malware attacks. HTTP/2 CONTINUATION Flood technique can be exploited in DoS attacks. BianLian group exploits ...
1 year ago Securityaffairs.com CVE-2020-3259 CVE-2023-22515 CVE-2023-40044 APT29 BianLian
newsletter Round 474 by Pierluigi Paganini - Microsoft Patch Tuesday security updates for May 2024 fixes 2 actively exploited zero-days. Microsoft fixed two zero-day bugs exploited in malware attacks. HTTP/2 CONTINUATION Flood technique can be exploited in DoS attacks. Critical Fortinet's ...
1 year ago Securityaffairs.com CVE-2020-3259 CVE-2023-49103 CVE-2023-22515 APT28 APT29 BianLian
US Health Dept Urges Hospitals to Patch Critical 'Citrix Bleed' Vulnerability - This week, the US Department of Health and Human Services has warned hospitals of the critical 'Citrix Bleed' Netscaler vulnerability that has been exploited by threat actors in cyberattacks. On Thursday, the department's security team, Health Sector ...
1 year ago Cysecurity.news CVE-2023-4966
Hackers use Citrix Bleed flaw in attacks on govt networks worldwide - Threat actors are leveraging the 'Citrix Bleed' vulnerability, tracked as CVE-2023-4966, to target government, technical, and legal organizations in the Americas, Europe, Africa, and the Asia-Pacific region. Researchers from Mandiant report that four ...
1 year ago Bleepingcomputer.com CVE-2023-4966 CVE-2023-3966

Cyber Trends (last 7 days)