CVE-Katalog
CVE-2021-36369
dropbear: CVE-2021-36369
- Schweregrad
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.86% · Oct 22, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | dropbear | sid | 2026.94-1 | fixed |
| Debian | dropbear | forky | 2026.94-1 | fixed |
| Debian | dropbear | trixie | 2025.89-1~deb13u1 | fixed |
| Debian | dropbear | trixie-security | 2025.89-1~deb13u1 | fixed |
| Debian | dropbear | bookworm | 2022.83-1+deb12u3 | fixed |
| Ubuntu | dropbear | pro | 2019.78-2build1 | vulnerable |
| Ubuntu | dropbear | pro | 2019.78-2ubuntu0.1~esm1 | fixed |
| Ubuntu | dropbear | 22.04 | 2020.81-3 | vulnerable |
| Ubuntu | dropbear | 22.04 | 2020.81-4 | vulnerable |
| Ubuntu | dropbear | 22.04 | 2020.81-5 | vulnerable |
| Ubuntu | dropbear | 22.04 | 2020.81-5ubuntu0.1 | fixed |
| Ubuntu | dropbear | 16.04 | 2014.65-1ubuntu2 | vulnerable |
| Ubuntu | dropbear | 16.04 | 2015.68-1 | vulnerable |
| Ubuntu | dropbear | 16.04 | 2015.70-1 | vulnerable |
| Ubuntu | dropbear | 16.04 | 2015.71-1 | vulnerable |
| Ubuntu | dropbear | 16.04 | 2016.72-1 | vulnerable |
| Ubuntu | dropbear | pro | 2019.78-2build1 | vulnerable |
| Ubuntu | dropbear | pro | 2019.78-2ubuntu0.1~esm1 | fixed |
| Ubuntu | dropbear | 22.04 | 2020.81-3 | vulnerable |
| Ubuntu | dropbear | 22.04 | 2020.81-4 | vulnerable |
| Ubuntu | dropbear | 22.04 | 2020.81-5 | vulnerable |
| Ubuntu | dropbear | 22.04 | 2020.81-5ubuntu0.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | dropbear | source | sid | 2022.82-1 | not yet assigned | Not reported | Not reported |
| Debian | dropbear | source | forky | 2022.82-1 | not yet assigned | Not reported | Not reported |
| Debian | dropbear | source | trixie | 2022.82-1 | not yet assigned | Not reported | Not reported |
| Debian | dropbear | source | bookworm | 2022.82-1 | not yet assigned | Not reported | Not reported |
| Ubuntu | dropbear | deb | pro | 2019.78-2ubuntu0.1~esm1 | Not reported | USN-7292-1 | Not reported |
| Ubuntu | dropbear | deb | 22.04 | 2020.81-5ubuntu0.1 | Not reported | USN-7292-1 | Not reported |
| Ubuntu | dropbear | deb | pro | 2019.78-2ubuntu0.1~esm1 | Not reported | UBUNTU-CVE-2021-36369 | Not reported |
| Ubuntu | dropbear | deb | 22.04 | 2020.81-5ubuntu0.1 | Not reported | UBUNTU-CVE-2021-36369 | Not reported |
OpenFactory catalog packages
Die Paketzuordnung läuft.
[Debian 12 (Bookworm)]
- [dropbear]Unbekannt
Details (2)
2022.83-1+deb12u3· all · bookwormBehoben · Behoben:
2022.82-1dsa · dropbear · debian · bookworm; dsa · dropbear · debian · 12
2022.83-1+deb12u3· all · bookwormBehoben · Behoben:
2022.82-1dsa · dropbear · debian · bookworm; dsa · dropbear · debian · 12
- [dropbear-bin]Unbekannt
Quellpaket: [dropbear]
Details (2)
2022.83-1+deb12u3· amd64 · bookwormBehoben · Behoben:
2022.82-1dsa · dropbear · debian · bookworm; dsa · dropbear · debian · 12
2022.83-1+deb12u3· arm64 · bookwormBehoben · Behoben:
2022.82-1dsa · dropbear · debian · bookworm; dsa · dropbear · debian · 12
- [dropbear-initramfs]Unbekannt
Quellpaket: [dropbear]
Details (2)
2022.83-1+deb12u3· all · bookwormBehoben · Behoben:
2022.82-1dsa · dropbear · debian · bookworm; dsa · dropbear · debian · 12
2022.83-1+deb12u3· all · bookwormBehoben · Behoben:
2022.82-1dsa · dropbear · debian · bookworm; dsa · dropbear · debian · 12
- [dropbear-run]Unbekannt
Quellpaket: [dropbear]
Details (2)
2022.83-1+deb12u3· all · bookwormBehoben · Behoben:
2022.82-1dsa · dropbear · debian · bookworm; dsa · dropbear · debian · 12
2022.83-1+deb12u3· all · bookwormBehoben · Behoben:
2022.82-1dsa · dropbear · debian · bookworm; dsa · dropbear · debian · 12
[Debian 13 (Trixie)]
- [dropbear]Unbekannt
Details (4)
2025.89-1~deb13u1· all · trixieBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
2025.89-1~deb13u1· all · trixieBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
2025.89-1~deb13u1· all · trixie-securityBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
2025.89-1~deb13u1· all · trixie-securityBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
- [dropbear-bin]Unbekannt
Quellpaket: [dropbear]
Details (4)
2025.89-1~deb13u1· amd64 · trixieBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
2025.89-1~deb13u1· arm64 · trixieBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
2025.89-1~deb13u1· amd64 · trixie-securityBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
2025.89-1~deb13u1· arm64 · trixie-securityBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
- [dropbear-initramfs]Unbekannt
Quellpaket: [dropbear]
Details (4)
2025.89-1~deb13u1· all · trixieBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
2025.89-1~deb13u1· all · trixieBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
2025.89-1~deb13u1· all · trixie-securityBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
2025.89-1~deb13u1· all · trixie-securityBehoben · Behoben:
2022.82-1dsa · dropbear · debian · 13
Beobachtet:
Referenzen
- [https://cert-portal.siemens.com/productcert/csaf/ssa-806742.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-36369]
- [https://osv.dev/vulnerability/DLA-3187-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-36369]
- [https://osv.dev/vulnerability/USN-7292-1]
- [https://security-tracker.debian.org/tracker/CVE-2021-36369]
[CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]