GreyNoise blog just out about #CitrixBleed2, they see exploitation from IPs in China from June 23rd targeting specifically Netscaler appliances https://www.greynoise.io/blog/exploitation-citrixbleed-2-cve-2025-5777-before-public-poc
I’m fairly certain the threat actor is Chinese and they reversed the patch to make the exploit.
Citrix continue to be MIA. They still have no detection guidance for customers, and haven’t told customers the extent of the issue.
#CitrixBleed2
New CitrixBleed 2 scan data:
https://raw.githubusercontent.com/GossiTheDog/scanning/refs/heads/main/CVE-2025-5777-CitrixBleed2-ElectricBoogaloo-patching.txt
+7000 extra hosts added this round, host list is so large you need to use the raw view to see it.
Next set of data publication likely Friday, a month since the patch became available.
3832 orgs/hosts still unpatched.
GreyNoise blog just out about #CitrixBleed2, they see exploitation from IPs in China from June 23rd targeting specifically Netscaler appliances https://www.greynoise.io/blog/exploitation-citrixbleed-2-cve-2025-5777-before-public-poc
Co-op finally admitted the entire membership database was stolen
I had this in the thread months ago, they originally tried to deny it entirely then tried to say ‘some’ data was accessed when they knew it was the whole thing.
https://www.bbc.co.uk/news/articles/cql0ple066po
Personally I think Co-op did a really good job getting out of that situation and minimising impact.
I definitely think if you have a LAPSUS$ style advanced persistent teenagers situation, tilt towards open and honest comms as those kids will use secrecy against ya. It’s 2025, it’s okay to say you got hacked, people largely understand. Also, in IR, lawyers are usually stuck in 1980 advice - it’s just advice, they ain’t yo boss.
. @briankrebs@infosec.exchange has broken the story that the key member (and teenager) of LAPSUS$ runs Scattered Spider
https://krebsonsecurity.com/2025/07/uk-charges-four-in-scattered-spider-ransom-group/
Co-op finally admitted the entire membership database was stolen
I had this in the thread months ago, they originally tried to deny it entirely then tried to say ‘some’ data was accessed when they knew it was the whole thing.
https://www.bbc.co.uk/news/articles/cql0ple066po
Citrix Netscaler internet scan still running, it's found another 1k vulnerable instances so far - will probably update Github later today or tomorrow morning.
It looks like we're back up to 18% of boxes being still vulnerable when the new list is out. It looks like a lot of orgs are patching from my list.
New CitrixBleed 2 scan data:
https://raw.githubusercontent.com/GossiTheDog/scanning/refs/heads/main/CVE-2025-5777-CitrixBleed2-ElectricBoogaloo-patching.txt
+7000 extra hosts added this round, host list is so large you need to use the raw view to see it.
Next set of data publication likely Friday, a month since the patch became available.
3832 orgs/hosts still unpatched.
CitrixBleed 2 update.
- Citrix have finally, quietly admitted exploitation in the wild -- by not commenting to press and then editing an old blog post and not mentioning it on their security update page.
- Orgs have been under attack from threat actors in Russia and China since June
- It's now under spray and pray, wide exploitation attempts.
https://doublepulsar.com/citrixbleed-2-situation-update-everybody-already-got-owned-503c6d06da9f
Citrix Netscaler internet scan still running, it's found another 1k vulnerable instances so far - will probably update Github later today or tomorrow morning.
It looks like we're back up to 18% of boxes being still vulnerable when the new list is out. It looks like a lot of orgs are patching from my list.
Updated Citrix scan results will go on Github in a few days, I've found a bug in the scan results setup which should add ~33% more hosts when fixed.
Spoiler:
CitrixBleed 2 update.
- Citrix have finally, quietly admitted exploitation in the wild -- by not commenting to press and then editing an old blog post and not mentioning it on their security update page.
- Orgs have been under attack from threat actors in Russia and China since June
- It's now under spray and pray, wide exploitation attempts.
https://doublepulsar.com/citrixbleed-2-situation-update-everybody-already-got-owned-503c6d06da9f
Imperva WAF have added detection and blocking for CitrixBleed 2 this weekend.
They see it being widely sprayed across the internet today - almost 12 million requests, log4shell level.
The only major vendor I’ve seen who hasn’t added a WAF rule is Citrix - they sell a WAF upsell module for Netscaler, but failed to add detection for their own vulnerability.
Updated Citrix scan results will go on Github in a few days, I've found a bug in the scan results setup which should add ~33% more hosts when fixed.
Spoiler:
207.218.103.174,*.attorneygeneral.gov|attorneygeneral.gov,13.1-52.19,VULNERABLE
207.218.103.19,*.attorneygeneral.gov|attorneygeneral.gov,13.1-52.19,VULNERABLE
If anybody knows anybody at the USG these are still unpatched today and getting owned still.
https://beta.shodan.io/host/207.218.103.19
https://beta.shodan.io/host/207.218.103.174
Updated CitrixBleed 2 scan results: https://github.com/GossiTheDog/scanning/blob/main/CVE-2025-5777-CitrixBleed2-ElectricBoogaloo-patching.txt
It's down from 24% unpatched to 17% unpatched
The results are partial still, the actual numbers still vuln will be higher.
Imperva WAF have added detection and blocking for CitrixBleed 2 this weekend.
They see it being widely sprayed across the internet today - almost 12 million requests, log4shell level.
The only major vendor I’ve seen who hasn’t added a WAF rule is Citrix - they sell a WAF upsell module for Netscaler, but failed to add detection for their own vulnerability.
Kevin Beaumont