3.7

CVE-2021-36368: debian debian_linux Improper Authentication

CVSS: 3.7v3.1LowModified
AliasesALPINE-CVE-2021-36368DEBIAN-CVE-2021-36368
Published 12-03-2022Last modified 29-05-2026
Open JSON

Vulnerability summary

CVE-2021-36368 is a low (CVSS 3.7) Improper Authentication vulnerability in debian debian_linux. EPSS estimates a 1.68% chance of exploitation in the next 30 days, higher than 76.5% of scored vulnerabilities.

Overall risk
15/100
0100
Low · default modelHow is this calculated?
CVSS score
3.7/10
010
Low · v3.1 (CVE.org)
EPSS score
1.68%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-03-2022
    PublishedVulnerability first disclosed.
  2. 29-05-2026
    Last modifiedVulnerability information updated.

Description

An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

1.68%

Chance of exploitation in the next 30 days

Percentile

77%

Versus all other CVEs

30-day change

0.00 pp

From 1.68% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.68%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
Alpine1 product
  • openssh< 8.9_p1-r0
Openbsd1 product

3 vendors · 4 products

References

7 links