No exploitation reported

CVE-2021-36369

No exploitation reported by the sources we read.

Published2022-10-12
WeaknessCWE-287

Am I 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 Dropbear through 2020.81. Due to a non-RFC-compliant check of the available authentication methods in the client-side SSH code, it is possible for an SSH server to change the login process in its favor. This attack can bypass additional security measures such as FIDO2 tokens or SSH-Askpass. Thus, it allows an attacker to abuse a forwarded agent for logging on to another server unnoticed.

Timeline

dates in UTC

2022-10-1221:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-36369?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-36369?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Debian debian linux

Branch	Affected	Fixed in	Source
10.0	= 10.0	no fix published	NVD

Dropbear ssh project dropbear ssh

Branch	Affected	Fixed in	Source
2020.81	≤ 2020.81	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

github.comRelease Notes
github.comRelease Notes

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-05-15
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.52025-05-15
NVDCVSS 3.17.5read 2026-10-23
CISA-ADPweakness (CWE)CWE-2872025-05-15
NVDweakness (CWE)CWE-287read 2026-10-23
FIRST EPSSEPSS score1.9 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: 2022-10-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-36369?

Is CVE-2021-36369 actively exploited?

Active exploitation of CVE-2021-36369 has not been confirmed. Its EPSS score was 1.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-36369?

CVE-2021-36369 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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