CVE-2021-22133 is a low-severity (CVSS 2.4) CWE-532 vulnerability in go.elastic.co/apm. A fix is available for go.elastic.co/apm — see the affected versions and patch details below.
Information Disclosure in go.elastic.co/apm
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2021-22133 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
go.elastic.co/apmReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
The Elastic APM agent for Go versions before 1.11.0 can leak sensitive HTTP header information when logging the details during an application panic. Normally, the APM agent will sanitize sensitive HTTP header details before sending the information to the APM server. During an application panic it is possible the headers will not be sanitized before being sent.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | go.elastic.co/apm | all versions | 1.11.0go get go.elastic.co/apm@v1.11.0 |
Affected Products
apm agentelasticDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for go.elastic.co/apm, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update go.elastic.co/apm to 1.11.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-22133 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
* Several components in the below products include an old reference to go.elastic.co/apm in their go.sum files, however no code is included. These components are thus not affected by this vulnerability: ** OpenShift Container Platform ** OpenShift Virtualization ** OpenShift Container Storage 4 ** Red Hat Advanced…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenShift Container Platform 4.8 | openshift4/ose-thanos-rhel8:v4.8.0-202106291913.p0.git.c358e96.assembly.stream | RHSA-2021:2438 |
Frequently Asked Questions
Is CVE-2021-22133 in your dependencies?
Find it across Go, including transitive dependencies.