Posts have been circulating publicly on the internet for several days about a “critical”, end of the world “zero day” in Apache Camel, CVE-2025–27636. Many of the posts explained in specific detail about how to exploit the vulnerability — despite the fact no CVE was filed, and no patches were available. The language in the posts have been extremely alarming, and have sparked panic amongst defenders.
One person posted their entire team had been stood up this weekend to deal with the situation — but they had no fixes and no clue what to do except panic.
The vulnerability was not being exploited by a malicious threat actor — but the details circulating publicly could have lead to that situation, this one is a case of the cyber industry being its own worst enemy.
The advisory is out now:
https://lists.apache.org/thread/l3zcg3vts88bmc7w8172wkgw610y693z
Updated versions are out for Apache Camel 4 — 4.10.2 and 4.8.5 — and the EOL’d 3.x version is going to get a patch soon as a courtesy (3.22.4).
It is actually a medium severity issue, with an important caveat. “It’s important to note that only methods in the same bean declared in the bean URI could be invoked.”
The PoC being described online is specifically built to the vulnerable.
The vulnerability does not mean that every application that uses Apache Camel is vulnerable, either. It requires a very specific set of circumstances to be vulnerable.
As a recommended mitigation from Apache, “Mitigation: You can easily work around this in your Camel applications by removing the headers in your Camel routes. There are many ways of doing this, also globally or per route. This means you could use the removeHeaders EIP, to filter out anything like “cAmel, cAMEL” etc, or in general everything not starting with “Camel”, “camel” or “org.apache.camel.”
In terms of threat intelligence, I go back to a point I’ve made online:
My recommendation for orgs is to calmly inform their development teams, if they use Apache Camel, to check the advisory linked above to assess if they are impacted, and either upgrade to a fixed release or apply the mitigation (in Camel Route) if vul
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