Debian Dropbear vulnerabilities

CVE-2026-3706 [LOW] CVE-2026-3706: dropbear - A vulnerability was determined in mkj Dropbear up to 2025.89. Impacted is the fu... A vulnerability was determined in mkj Dropbear up to 2025.89. Impacted is the function unpackneg of the file src/curve25519.c of the component S Range Check. This manipulation causes improper verification of cryptographic signature. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitability is considered difficult. The a

CVE-2025-47203 [MEDIUM] CVE-2025-47203: dropbear - dbclient in Dropbear SSH before 2025.88 allows command injection via an untruste... dbclient in Dropbear SSH before 2025.88 allows command injection via an untrusted hostname argument, because a shell is used. Scope: local bookworm: resolved (fixed in 2022.83-1+deb12u3) bullseye: resolved (fixed in 2020.81-3+deb11u3) forky: resolved (fixed in 2025.88-1) sid: resolved (fixed in 2025.88-1) trixie: resolved (fixed in 2025.88-1)

CVE-2025-14282 [MEDIUM] CVE-2025-14282: dropbear - A flaw was found in Dropbear. When running in multi-user mode and authenticating... A flaw was found in Dropbear. When running in multi-user mode and authenticating users, the dropbear ssh server does the socket forwardings requested by the remote client as root, only switching to the logged-in user upon spawning a shell or performing some operations like reading the user's files. With the recent ability of also using unix domain sockets as the

CVE-2023-48795 [MEDIUM] CVE-2023-48795: dropbear - The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH bef... The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabl

CVE-2021-36369 [HIGH] CVE-2021-36369: dropbear - An issue was discovered in Dropbear through 2020.81. Due to a non-RFC-compliant ... 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

CVE-2020-36254 [MEDIUM] CVE-2020-36254: dropbear - scp.c in Dropbear before 2020.79 mishandles the filename of . or an empty filena... scp.c in Dropbear before 2020.79 mishandles the filename of . or an empty filename, a related issue to CVE-2018-20685. Scope: local bookworm: resolved (fixed in 2020.79-1) bullseye: resolved (fixed in 2020.79-1) forky: resolved (fixed in 2020.79-1) sid: resolved (fixed in 2020.79-1) trixie: resolved (fixed in 2020.79-1)

CVE-2019-12953 [MEDIUM] CVE-2019-12953: dropbear - Dropbear 2011.54 through 2018.76 has an inconsistent failure delay that may lead... Dropbear 2011.54 through 2018.76 has an inconsistent failure delay that may lead to revealing valid usernames, a different issue than CVE-2018-15599. Scope: local bookworm: resolved (fixed in 2019.78-1) bullseye: resolved (fixed in 2019.78-1) forky: resolved (fixed in 2019.78-1) sid: resolved (fixed in 2019.78-1) trixie: resolved (fixed in 2019.78-1)

CVE-2018-15599 [MEDIUM] CVE-2018-15599: dropbear - The recv_msg_userauth_request function in svr-auth.c in Dropbear through 2018.76... The recv_msg_userauth_request function in svr-auth.c in Dropbear through 2018.76 is prone to a user enumeration vulnerability because username validity affects how fields in SSH_MSG_USERAUTH messages are handled, a similar issue to CVE-2018-15473 in an unrelated codebase. Scope: local bookworm: resolved (fixed in 2018.76-4) bullseye: resolved (fixed in 2018.76-4)

CVE-2017-9078 [HIGH] CVE-2017-9078: dropbear - The server in Dropbear before 2017.75 might allow post-authentication root remot... The server in Dropbear before 2017.75 might allow post-authentication root remote code execution because of a double free in cleanup of TCP listeners when the -a option is enabled. Scope: local bookworm: resolved (fixed in 2016.74-5) bullseye: resolved (fixed in 2016.74-5) forky: resolved (fixed in 2016.74-5) sid: resolved (fixed in 2016.74-5) trixie: resolved (fixed

CVE-2017-2659 [MEDIUM] CVE-2017-2659: dropbear - It was found that dropbear before version 2013.59 with GSSAPI leaks whether give... It was found that dropbear before version 2013.59 with GSSAPI leaks whether given username is valid or invalid. When an invalid username is given, the GSSAPI authentication failure was incorrectly counted towards the maximum allowed number of password attempts. Scope: local bookworm: resolved (fixed in 2013.60-1) bullseye: resolved (fixed in 2013.60-1) forky: resol

CVE-2017-9079 [MEDIUM] CVE-2017-9079: dropbear - Dropbear before 2017.75 might allow local users to read certain files as root, i... Dropbear before 2017.75 might allow local users to read certain files as root, if the file has the authorized_keys file format with a command= option. This occurs because ~/.ssh/authorized_keys is read with root privileges and symlinks are followed. Scope: local bookworm: resolved (fixed in 2016.74-5) bullseye: resolved (fixed in 2016.74-5) forky: resolved (fixed i

CVE-2016-7406 [CRITICAL] CVE-2016-7406: dropbear - Format string vulnerability in Dropbear SSH before 2016.74 allows remote attacke... Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument. Scope: local bookworm: resolved (fixed in 2016.74-1) bullseye: resolved (fixed in 2016.74-1) forky: resolved (fixed in 2016.74-1) sid: resolved (fixed in 2016.74-1) trixie: resolved (fi

CVE-2016-7407 [CRITICAL] CVE-2016-7407: dropbear - The dropbearconvert command in Dropbear SSH before 2016.74 allows attackers to e... The dropbearconvert command in Dropbear SSH before 2016.74 allows attackers to execute arbitrary code via a crafted OpenSSH key file. Scope: local bookworm: resolved (fixed in 2016.74-1) bullseye: resolved (fixed in 2016.74-1) forky: resolved (fixed in 2016.74-1) sid: resolved (fixed in 2016.74-1) trixie: resolved (fixed in 2016.74-1)

CVE-2016-7408 [HIGH] CVE-2016-7408: dropbear - The dbclient in Dropbear SSH before 2016.74 allows remote attackers to execute a... The dbclient in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via a crafted (1) -m or (2) -c argument. Scope: local bookworm: resolved (fixed in 2016.74-1) bullseye: resolved (fixed in 2016.74-1) forky: resolved (fixed in 2016.74-1) sid: resolved (fixed in 2016.74-1) trixie: resolved (fixed in 2016.74-1)

CVE-2016-3116 [MEDIUM] CVE-2016-3116: dropbear - CRLF injection vulnerability in Dropbear SSH before 2016.72 allows remote authen... CRLF injection vulnerability in Dropbear SSH before 2016.72 allows remote authenticated users to bypass intended shell-command restrictions via crafted X11 forwarding data. Scope: local bookworm: resolved (fixed in 2016.72-1) bullseye: resolved (fixed in 2016.72-1) forky: resolved (fixed in 2016.72-1) sid: resolved (fixed in 2016.72-1) trixie: resolved (fixed in 20

CVE-2016-7409 [MEDIUM] CVE-2016-7409: dropbear - The dbclient and server in Dropbear SSH before 2016.74, when compiled with DEBUG... The dbclient and server in Dropbear SSH before 2016.74, when compiled with DEBUG_TRACE, allows local users to read process memory via the -v argument, related to a failed remote ident. Scope: local bookworm: resolved (fixed in 2016.74-1) bullseye: resolved (fixed in 2016.74-1) forky: resolved (fixed in 2016.74-1) sid: resolved (fixed in 2016.74-1) trixie: resolved

CVE-2013-4421 [MEDIUM] CVE-2013-4421: dropbear - The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 al... The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed. Scope: local bookworm: resolved (fixed in 2012.55-1.4) bullseye: resolved (fixed in 2012.55-1.4) forky: resolved (fixed in 2012.55-1.4) sid: res

CVE-2013-4434 [MEDIUM] CVE-2013-4434: dropbear - Dropbear SSH Server before 2013.59 generates error messages for a failed logon a... Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with different time delays depending on whether the user account exists, which allows remote attackers to discover valid usernames. Scope: local bookworm: resolved (fixed in 2012.55-1.4) bullseye: resolved (fixed in 2012.55-1.4) forky: resolved (fixed in 2012.55-1.4) sid: resolve

CVE-2012-0920 [HIGH] CVE-2012-0920: dropbear - Use-after-free vulnerability in Dropbear SSH Server 0.52 through 2012.54, when c... Use-after-free vulnerability in Dropbear SSH Server 0.52 through 2012.54, when command restriction and public key authentication are enabled, allows remote authenticated users to execute arbitrary code and bypass command restrictions via multiple crafted command requests, related to "channels concurrency." Scope: local bookworm: resolved (fixed in 2012.55-1) bullseye

CVE-2007-1099 [HIGH] CVE-2007-1099: dropbear - dbclient in Dropbear SSH client before 0.49 does not sufficiently warn the user ... dbclient in Dropbear SSH client before 0.49 does not sufficiently warn the user when it detects a hostkey mismatch, which might allow remote attackers to conduct man-in-the-middle attacks. Scope: local bookworm: resolved (fixed in 0.49-1) bullseye: resolved (fixed in 0.49-1) forky: resolved (fixed in 0.49-1) sid: resolved (fixed in 0.49-1) trixie: resolved (fixed in