THREATPORT/VULNERABILITY/CVE-2021-3121
HIGH SEVERITY

CVE-2021-3121

Protobuf vulnerability

CVSS
8.6
EPSS
3.5%
EPSS pct
88th
Exploited
No known
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.
Affected vendor
Golang
Affected product
Protobuf
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness type (CWE)
  • CWE-129 — Improper Validation of Array Index
Published
2021-01-11

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to confidentiality, low impact to integrity, high impact to availability.

Its EPSS score of 3.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2021-3121

  • Confirm whether Golang Protobuf is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-3121.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-3121

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