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Xfinity's Infinite Challenge: Citrix Bleed


Hey everyone, got some techy tea to spill about the latest breach! So, Xfinity just let the cat out of the bag a few weeks ago that their Citrix server was hacked back in October, and yep, customer info got swiped. 

Here’s the lowdown: Around late October, Xfinity noticed something fishy in their network. Turns out, it was linked to this big, bad bug called Citrix Bleed (fancy name for a nasty vulnerability). This bugger had been lurking around since late August, and boy, did it make a mess. 

Fast forward to November, and Xfinity’s like, "Oops, looks like data got taken." And we're not talking just a few accounts here – usernames and passwords of a whopping 35.8 million people were affected!


Citrix Vulnerability: The Starting Point

Here’s the backstory: On October 10, 2023, Citrix, a software provider used by loads of companies (including Xfinity), flagged a vulnerability. Xfinity jumped into action, patching up this security hole by October 23. But during a routine security check on October 25, they spotted something fishy – signs of unauthorized access to their systems between October 16 and 19, thanks to this very vulnerability.


Investigation and Discovery

Xfinity didn’t waste any time. They alerted the feds and started digging into the breach. By November 16, they figured out some info was likely grabbed by the intruders. On December 6, after a deep dive into their data, they confirmed that usernames and hashed passwords were scooped up. And for some customers, even more info like contact details and parts of social security numbers were involved.


Proactive Measures and Customer Guidance

To keep things locked down, Xfinity’s got all its customers resetting their passwords. They’re also big on pushing two-factor or multi-factor authentication – a smart move to double down on security. If you're using the same password or security questions elsewhere, Xfinity’s advice is clear: change ‘em!


Citrix Bleed: The Vulnerability at the Heart of the Breach

Let’s learn more about Citrix Bleed. It’s this nasty software vulnerability that's been the talk of the town in cybersecurity circles. It's been linked to attacks on governments and critical infrastructures, but here's a silver lining – there's a patch available.


A Big Deal for Big Names

We're talking about a vulnerability in Citrix NetScaler web application delivery control and NetScaler Gateway appliances, officially tagged as CVE-2023-4966. Federal officials and cybersecurity experts are shining a spotlight on this issue, dishing out advice, including indicators of compromise and detection methods. It's serious enough that big names like Boeing have felt the heat from ransomware exploiting this flaw.


Hackers Having a Field Day

Here's the scary part: hackers exploiting Citrix Bleed can bypass passwords and multifactor authentication, leading to hijacked user sessions. This gives them elevated permissions to swipe credentials, move around systems, and access sensitive data. To top it off, it's relatively easy to exploit, making unpatched software a prime target.


What Can Organizations Do?

First things first, get that patch from Citrix, released in early October. But there's a catch – attackers have been exploiting this since August 2023. And even after patching, compromised sessions might still be active. So, it's not just about updating; organizations need to use specific commands to clear out any lingering sessions. The Department of Health and Human Services’ has its own Cybersecurity Coordination Center (HC3 for short) to deal with widespread vulnerabilities like this. Their advice? Update and then run these commands to clean house:

  • kill aaa session -all
  • kill icaconnection -all
  • kill rdp connection -all
  • kill pcoipConnection -all
  • clear lb persistentSessions

More details can be found in their bulletin here.


Xfinity's Breach and Proactive Steps

Now back to Xfinity. After patching the Citrix vulnerability and discovering unauthorized access, they've been on their toes to protect customer accounts. Along with password resets, they're pushing for two-factor or multi-factor authentication big time. If you’re an Xfinity user, it's also wise to change passwords for other accounts where you've used the same credentials.


Need Help? Xfinity’s Listening

Got a question or feeling jittery about all this? Reach out to Xfinity’s 24/7 call center at 888-799-2560. For more detailed info, head to


Staying Ahead of the Curve

Staying ahead of the game and ensuring your software is always updated is crucial. It doesn't matter if you're just one person or a whole organization; staying on top of updates and keeping an eye out for any security breaches is absolutely essential. Let's all do our part to maintain a safer world for all.