5.3

CVE-2021-33197: golang go Missing Authorization

Modified
AliasesUBUNTU-CVE-2021-33197DEBIAN-CVE-2021-33197GO-2021-0241
Published 02-08-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-33197 is a medium (CVSS 5.3) Missing Authorization vulnerability in golang go. EPSS estimates a 2.26% chance of exploitation in the next 30 days, higher than 83% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.3/10
010
Medium · v3.1 (NVD)
EPSS score
2.26%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 24 · Related 7
MGASA-2021-0369OPENSUSE-SU-2021:0950-1OPENSUSE-SU-2021:2186-1OPENSUSE-SU-2021:2214-1OPENSUSE-SU-2024:10808-1OPENSUSE-SU-2024:10809-1

Timeline

  1. 02-08-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

In Go before 1.15.13 and 1.16.x before 1.16.5, some configurations of ReverseProxy (from net/http/httputil) result in a situation where an attacker is able to drop arbitrary headers.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

2.26%

Chance of exploitation in the next 30 days

Percentile

83%

Versus all other CVEs

30-day change

No change 0.00 pp

From 2.26% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (groups.google.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu2 products
  • golang-1.16All versions (No fix recorded)
  • golang-1.8All versions (No fix recorded)
Alpine1 product
  • go≥ 1.16.0, < 1.15.13-r0 | ≥ 1.16.0, < 1.16.5-r0
Debian1 product
  • golang-1.15< 1.15.9-5
Go1 product
  • stdlib≥ 1.16.0-0, < 1.16.5
Golang1 product
  • go< 1.15.13 | ≥ 1.16.0, < 1.16.5

5 vendors · 6 products

References

12 links
Show all 12 references