CVE-2021-3121
No exploitation reported by the sources we read.
- Published2021-01-11
- Fixed in1.10.2 · 1.9.9 · 1.8.15
- WeaknessCWE-129
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
An issue was discovered in GoGo Protobuf before 1.3.2. plugin/unmarshal/unmarshal.go lacks certain index validation, aka the "skippy peanut butter" issue.
Timeline
dates in UTC- 2021-01-1106:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-3121?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-3121?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.10 | ≥ 1.10.0, < 1.10.2 | 1.10.2 | NVD |
| 1.9 | ≥ 1.9.0, < 1.9.9 | 1.9.9 | NVD |
| 1.8 | < 1.8.15 | 1.8.15 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.3 | < 1.3.2 | 1.3.2 | NVD |
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.
Vendor advisories
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.9 security update
Red Hat Security Advisory: OpenShift Container Platform 4.8.2 bug fix and security update
Fix
- Update Hashicorp consul to 1.10.2 · 1.9.9 · 1.8.15
- Vendor fix Red Hat Product Security RHSA-2022:1276 · 4 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
- Vendor fix Red Hat Product Security RHSA-2021:2438 · 108 productsFor OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-r…
Advisories and patches
- github.comPatch
- github.comPatch
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.18.6read 2026-10-23
- NVDCVSS 2.07.5read 2026-10-23
- NVDweakness (CWE)CWE-129read 2026-10-23
- FIRST EPSSEPSS score3.4 %2026-10-22
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
- Published
- 2021-01-11
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-3121?
Is CVE-2021-3121 actively exploited?
What is the CVSS score for CVE-2021-3121?
Running OpenShift Container Platform? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.