Citrix Bleed

Vulnerability Profile Updated a month ago
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Citrix Bleed, identified as CVE-2023-4966, is a severe software vulnerability in Citrix Netscaler Gateway and Netscaler ADC products, with a high CVSS score of 9.4 indicating its critical nature. This flaw allows for sensitive information disclosure, bypassing password requirements and multifactor authentication measures, thereby providing deep system-level access that enables sophisticated and hard-to-detect intrusions. The vulnerability was widely exploited by ransomware groups such as LockBit, Medusa, and ALPHV (BlackCat), especially towards the end of 2023. The exploitation of Citrix Bleed has led to numerous successful attacks and compromises by these cybercriminal groups since November 2023. High-profile targets like Boeing and Allen & Overy were significantly impacted, with the former experiencing a disruptive breach due to the exploitation of this vulnerability. LockBit operators have been particularly active in leveraging Citrix Bleed to establish persistence and pivot across networks during their ransomware attacks. Other organizations, such as Fred Hutch, are still investigating breaches believed to be linked to this vulnerability. To mitigate the risks associated with Citrix Bleed, cybersecurity teams advise organizations to implement specific countermeasures. Product protections from vendors such as Palo Alto Networks have also been developed to guard against this exploit. However, despite these efforts, the 'mass exploitation' of Citrix Bleed continues, with new vulnerabilities being uncovered frequently, demonstrating the ongoing challenges in managing cybersecurity threats.
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Possible Aliases / Cluster overlaps
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IDVotesProfile Description
CVE-2023-4966
8
CVE-2023-4966, also known as "Citrix Bleed," is a critical zero-day vulnerability affecting Citrix Netscaler Gateway and Netscaler ADC products. This sensitive information disclosure vulnerability enables threat actors to bypass multifactor authentication using stolen session tokens, making it parti
Miscellaneous Associations
Other elements of context that could aid in the identification of relevance
netscaler
Vulnerability
Ransomware
citrix
Exploit
CISA
Zero Day
Malware
Moveit
Health
Exploits
ICBC
Apache Activ...
Uk
Ardent
Github
Hospitals
Healthcare
Toyota
Xfinity
WinRAR
Manageengine
Dragos
Net
Atlassian
Confluence
Proxy
Boeing
Encrypt
Zero Day
Ransom
Reconnaissance
Lateral Move...
Cybercrime
State Sponso...
Apache
Activemq
Associated Malware
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IDTypeVotesProfile Description
LockbitTargets
9
LockBit is a significant malware operation, first surfacing in September 2019 and becoming one of the most active ransomware groups by 2022. Operating under a Ransomware-as-a-Service (RaaS) model, LockBit recruited affiliates to execute attacks using its tools and infrastructure. From its first obse
AkiraUnspecified
1
Akira is a compact C++ ransomware, compatible with both Windows and Linux systems, that has wreaked havoc across various sectors. Known for its minimalistic JQuery Terminal-based hidden service for victim communication, this malware has impacted over 60 organizations worldwide. It operates by infilt
BlackbastaUnspecified
1
BlackBasta is a malicious software (malware) that gained prominence in 2022, primarily known for its ransomware capabilities. It operates by infecting systems through suspicious downloads, emails, or websites, often unbeknownst to the user, and can steal personal information, disrupt operations, or
BlacksuitUnspecified
1
BlackSuit is a sophisticated malware, specifically a ransomware variant, believed to be a rebranding of the Royal ransomware gang, itself a descendant of the Russian Conti gang. This assertion is supported by similarities in the code between Royal and BlackSuit, as per various sources. The Cybersecu
Associated Threat Actors
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IDTypeVotesProfile Description
AlphvTargets
4
AlphV, also known as BlackCat, is a significant threat actor in the cybersecurity landscape. In 2023, they were responsible for approximately 9.7% of total leak site posts, second only to other prominent ransomware groups. They notably stole 5TB of data from Morrison Community Hospital, and it's est
Medusahas used
2
Medusa, a threat actor known for its ransomware activities, has been on the rise since late 2023, leveraging a zero-day exploit for the Citrix Bleed vulnerability (CVE-2023-4966) alongside other groups like LockBit and ALPHV (BlackCat). This vulnerability led to numerous compromises by these groups
Associated Vulnerabilities
To see the evidence that has resulted in this association, create a free account
IDTypeVotesProfile Description
On Citrix BleedUnspecified
1
None
Log4ShellUnspecified
1
Log4Shell is a critical software vulnerability (CVE-2021-44228, CVE-2021-45046, and CVE-2021-45105) in the logging feature of the Java programming language, known as Log4j. This flaw was publicly disclosed on December 9, 2021, impacting millions of devices and applications globally, including those
Citrix Bleed CveUnspecified
1
None
CVE-2022-47966Unspecified
1
CVE-2022-47966 is a critical vulnerability discovered in Zoho ManageEngine ServiceDesk Plus, a widely used IT management software. The flaw was exploited by malicious actors to gain unauthorized access to the organization's systems and networks. The exploitation started just five days after proof-of
CVE-2023-49103Unspecified
1
None
CVE-2023-36934Unspecified
1
CVE-2023-36934 is a critical vulnerability that was identified in MOVEit Transfer's web application. This flaw in software design or implementation was published on July 5th, and it allowed for unauthenticated access to the database by submitting a payload to an application endpoint. This security b
Gandcrab/revilUnspecified
1
None
Source Document References
Information about the Citrix Bleed Vulnerability was read from the documents corpus below. This display is limited to 20 results, create a free account to see more
SourceCreatedAtTitle
CERT-EU
5 months ago
Infographic: A History of Network Device Threats and What Lies Ahead | #ransomware | #cybercrime | National Cyber Security Consulting
CERT-EU
7 months ago
Citrix Bleed Vulnerability: SafeBreach Coverage for US-CERT Alert (AA23-325A)
DARKReading
7 months ago
'CitrixBleed' Linked to Ransomware Hit on China's State-Owned Bank
CERT-EU
3 months ago
LockBit Affiliate Sentenced to 4 Years in Canada, Faces Extradition | #cybercrime | #infosec | National Cyber Security Consulting
Malwarebytes
6 months ago
Comcast’s Xfinity breached by Citrix Bleed; 36 million customer’s data accessed | Malwarebytes
Securityaffairs
7 months ago
Major Australian ports blocked after a cyber attack on DP World
CERT-EU
8 months ago
Citrix urges
CERT-EU
4 months ago
Post-LockBit, How Will the Ransomware Ecosystem Evolve? | #hacking | #cybersecurity | #infosec | #comptia | #pentest | #ransomware | National Cyber Security Consulting
CERT-EU
6 months ago
Toyota Ransomware Attack Exposes Customers Personal Data | #hacking | #cybersecurity | #infosec | #comptia | #pentest | #ransomware | National Cyber Security Consulting
CERT-EU
6 months ago
Top 8 Cyber Attack news headlines trending on Google - Cybersecurity Insiders
BankInfoSecurity
7 months ago
Amid Citrix Bleed Exploits, NetScaler Warns: Kill Sessions
CERT-EU
7 months ago
Citrix Bleed widely exploitated, warn government agencies
CERT-EU
6 months ago
Hackers steal data from millions of Xfinity customers via Citrix Bleed vulnerability | #hacking | #cybersecurity | #infosec | #comptia | #pentest | #hacker | National Cyber Security Consulting
CERT-EU
7 months ago
Industrial and Commercial Bank of China hit by ransomware attack
BankInfoSecurity
6 months ago
Feds, AHA Urge Hospitals to Mitigate Citrix Bleed Threats
CERT-EU
7 months ago
Week in review: LockBit exploits Citrix Bleed, Apache ActiveMQ bug exploited for cryptojacking
CERT-EU
5 months ago
Citrix warns of new Netscaler zero-days exploited in attacks
CERT-EU
6 months ago
Citrix Bleed attacks impact health sector
CERT-EU
7 months ago
Ransomware Attack on ICBC Bank Causes Severe Disruptions
CERT-EU
3 months ago
LockBit Ransomware Affiliates Leverage Citrix Bleed Vulnerability (CVE-2023-4966)