CVE-2021-36221
No exploitation reported by the sources we read.
- Published2021-08-08
- WeaknessCWE-362
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Go before 1.15.15 and 1.16.x before 1.16.7 has a race condition that can lead to a net/http/httputil ReverseProxy panic upon an ErrAbortHandler abort.
Timeline
dates in UTC- 2021-08-0806:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-36221?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-36221?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 33.x | = 33 | no fix published | NVD |
| 34.x | = 34 | no fix published | NVD |
| 35.x | = 35 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.16 | ≥ 1.16.0, < 1.16.7 | 1.16.7 | NVD · OSV |
| 1.16 | ≥ 1.16.0-0, < 1.16.7 | 1.16.7 | OSV |
| 1.15 | < 1.15.15 | 1.15.15 | NVD · OSV |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.0 | = 9.0 | no fix published | NVD |
2 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- delveAlmaLinux:8all versions · fixed in 1.6.0-1.module_el8.5.0+2604+960c7771
Vendor advisories
Red Hat Security Advisory: OpenShift Virtualization 4.10.1 Images security and bug fix update
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.10.0 enhancement, security & bug fix update
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.10.0 RPM security,enhancement&bugfix update
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.9 security update
Fix
- Vendor fix Red Hat Product Security RHSA-2022:4668 · 2 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2022:1372 · 72 productsFor details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2022:1276 · 23 productsThe OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/latest/service_mesh/v2x/servicemesh-release-notes.html
- Workaround from the vendor Red Hat Product Security RHSA-2022:4668 · 2 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Advisories and patches
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.15.9read 2026-10-23
- NVDCVSS 2.04.3read 2026-10-23
- NVDweakness (CWE)CWE-362read 2026-10-23
- FIRST EPSSEPSS score3.1 %2026-10-23
- OSVaffected packages—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2021-08-08
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-36221?
Is CVE-2021-36221 actively exploited?
What is the CVSS score for CVE-2021-36221?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.