Connect with us

Hi, what are you looking for?



Exploitation of Citrix ShareFile Vulnerability Spikes as CISA Issues Warning 

Exploitation of a Citrix ShareFile vulnerability tracked as CVE-2023-24489 has spiked as CISA added it to its ‘must patch’ catalog.

Citrix CVE-2023-24489 exploited

Exploitation attempts targeting a remote code execution flaw in Citrix’s ShareFile product have spiked just as the US Cybersecurity and Infrastructure Security Agency (CISA) added it to its Known Exploited Vulnerabilities Catalog. 

The vulnerability affecting the ShareFile file sharing and collaboration product is tracked as CVE-2023-24489 and it has been assigned a ‘critical’ severity rating. It can allow an unauthenticated attacker to upload arbitrary files and possibly achieve remote code execution.

When details of the security hole were disclosed by Assetnote in early July — Assetnote researchers discovered the flaw — the company warned that there had been between 1,000 and 6,000 internet-exposed ShareFile instances. 

Citrix announced the availability of patches for CVE-2023-24489 on June 13 and exploitation started in late July, with threat intelligence firm GreyNoise seeing attack attempts coming from a handful of IP addresses.

CISA added CVE-2023-24489 to its Known Exploited Vulnerabilities Catalog on Wednesday, instructing government organizations to address it by September 6. On the same day, GreyNoise reported seeing a “huge spike” in exploitation attempts, coming from 72 unique IPs.  

It’s worth noting that GreyNoise has not recorded any other attacks between late July and now. 

It’s unclear what the attackers are trying to achieve, but Citrix vulnerabilities have been known to be exploited by both financially motivated cybercriminals and state-sponsored threat actors.   

Advertisement. Scroll to continue reading.

News of a spike in CVE-2023-24489 exploitation comes just days after NCC Group reported seeing 2,000 Citrix NetScaler instances that had been backdoored following exploitation of a recent vulnerability tracked as CVE-2023-3519. The flaw has been exploited since at least June, including against critical infrastructure organizations, when it still had a zero-day status. 

Related: Over 20,000 Citrix Appliances Vulnerable to New Exploit

Written By

Eduard Kovacs (@EduardKovacs) is a managing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Click to comment

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

Join security experts as they discuss ZTNA’s untapped potential to both reduce cyber risk and empower the business.


Join Microsoft and Finite State for a webinar that will introduce a new strategy for securing the software supply chain.


Expert Insights

Related Content


Less than a week after announcing that it would suspended service indefinitely due to a conflict with an (at the time) unnamed security researcher...

Data Breaches

OpenAI has confirmed a ChatGPT data breach on the same day a security firm reported seeing the use of a component affected by an...

Risk Management

The supply chain threat is directly linked to attack surface management, but the supply chain must be known and understood before it can be...

IoT Security

A group of seven security researchers have discovered numerous vulnerabilities in vehicles from 16 car makers, including bugs that allowed them to control car...


Patch Tuesday: Microsoft warns vulnerability (CVE-2023-23397) could lead to exploitation before an email is viewed in the Preview Pane.


A researcher at IOActive discovered that home security systems from SimpliSafe are plagued by a vulnerability that allows tech savvy burglars to remotely disable...


The latest Chrome update brings patches for eight vulnerabilities, including seven reported by external researchers.


Patch Tuesday: Microsoft calls attention to a series of zero-day remote code execution attacks hitting its Office productivity suite.