Debian Putty vulnerabilities

CVE-2026-4115 [MEDIUM] CVE-2026-4115: putty - A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verif... A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is told to be difficult. The

CVE-2024-31497 [MEDIUM] CVE-2024-31497: filezilla - In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an ... In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user's NIST P-521 secret key via a quick attack in approximately 60 signatures. This is especially important in a scenario where an adversary is able to read messages signed by PuTTY or Pageant. The required set of signed messages may be publicly readable becaus

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-2021-36367 [HIGH] CVE-2021-36367: putty - PuTTY through 0.75 proceeds with establishing an SSH session even if it has neve... PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user). Scope: loc

CVE-2021-33500 [HIGH] CVE-2021-33500: putty - PuTTY before 0.75 on Windows allows remote servers to cause a denial of service ... PuTTY before 0.75 on Windows allows remote servers to cause a denial of service (Windows GUI hang) by telling the PuTTY window to change its title repeatedly at high speed, which results in many SetWindowTextA or SetWindowTextW calls. NOTE: the same attack methodology may affect some OS-level GUIs on Linux or other platforms for similar reasons. Scope: local bookworm:

CVE-2020-14002 [MEDIUM] CVE-2020-14002: putty - PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information ... PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). Scope: local bookworm: resolved (fixed in 0.74-1) bullseye: resolved (fixed in 0.74-1) forky: resolved (fixed

CVE-2019-9895 [CRITICAL] CVE-2019-9895: putty - In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow ex... In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding. Scope: local bookworm: resolved (fixed in 0.70-6) bullseye: resolved (fixed in 0.70-6) forky: resolved (fixed in 0.70-6) sid: resolved (fixed in 0.70-6) trixie: resolved (fixed in 0.70-6)

CVE-2019-9898 [CRITICAL] CVE-2019-9898: putty - Potential recycling of random numbers used in cryptography exists within PuTTY b... Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71. Scope: local bookworm: resolved (fixed in 0.70-6) bullseye: resolved (fixed in 0.70-6) forky: resolved (fixed in 0.70-6) sid: resolved (fixed in 0.70-6) trixie: resolved (fixed in 0.70-6)

CVE-2019-17068 [HIGH] CVE-2019-17068: putty - PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, wh... PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, which may allow a session to be affected by malicious clipboard content. Scope: local bookworm: resolved (fixed in 0.73-1) bullseye: resolved (fixed in 0.73-1) forky: resolved (fixed in 0.73-1) sid: resolved (fixed in 0.73-1) trixie: resolved (fixed in 0.73-1)

CVE-2019-9894 [HIGH] CVE-2019-9894: putty - A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71... A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification. Scope: local bookworm: resolved (fixed in 0.70-6) bullseye: resolved (fixed in 0.70-6) forky: resolved (fixed in 0.70-6) sid: resolved (fixed in 0.70-6) trixie: resolved (fixed in 0.70-6)

CVE-2019-9897 [HIGH] CVE-2019-9897: putty - Multiple denial-of-service attacks that can be triggered by writing to the termi... Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71. Scope: local bookworm: resolved (fixed in 0.70-6) bullseye: resolved (fixed in 0.70-6) forky: resolved (fixed in 0.70-6) sid: resolved (fixed in 0.70-6) trixie: resolved (fixed in 0.70-6)

CVE-2019-9896 [HIGH] CVE-2019-9896: putty - In PuTTY versions before 0.71 on Windows, local attackers could hijack the appli... In PuTTY versions before 0.71 on Windows, local attackers could hijack the application by putting a malicious help file in the same directory as the executable. Scope: local bookworm: resolved bullseye: resolved forky: resolved sid: resolved trixie: resolved

CVE-2019-17067 [CRITICAL] CVE-2019-17067: putty - PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets,... PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to listen on the same port to steal an incoming connection. Scope: local bookworm: resolved bullseye: resolved forky: resolved sid: resolved trixie: resolved

CVE-2019-17069 [HIGH] CVE-2019-17069: putty - PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service ... PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing freed memory locations via an SSH1_MSG_DISCONNECT message. Scope: local bookworm: resolved (fixed in 0.73-1) bullseye: resolved (fixed in 0.73-1) forky: resolved (fixed in 0.73-1) sid: resolved (fixed in 0.73-1) trixie: resolved (fixed in 0.73-1)

CVE-2017-6542 [CRITICAL] CVE-2017-6542: putty - The ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers... The ssh_agent_channel_data function in PuTTY before 0.68 allows remote attackers to have unspecified impact via a large length value in an agent protocol message and leveraging the ability to connect to the Unix-domain socket representing the forwarded agent connection, which trigger a buffer overflow. Scope: local bookworm: resolved (fixed in 0.67-3) bullseye: reso

CVE-2016-2563 [CRITICAL] CVE-2016-2563: putty - Stack-based buffer overflow in the SCP command-line utility in PuTTY before 0.67... Stack-based buffer overflow in the SCP command-line utility in PuTTY before 0.67 and KiTTY 0.66.6.3 and earlier allows remote servers to cause a denial of service (stack memory corruption) or execute arbitrary code via a crafted SCP-SINK file-size response to an SCP download request. Scope: local bookworm: resolved (fixed in 0.67-1) bullseye: resolved (fixed in 0.67

CVE-2016-6167 [HIGH] CVE-2016-6167: putty - Multiple untrusted search path vulnerabilities in Putty beta 0.67 allow local us... Multiple untrusted search path vulnerabilities in Putty beta 0.67 allow local users to execute arbitrary code and conduct DLL hijacking attacks via a Trojan horse (1) UxTheme.dll or (2) ntmarta.dll file in the current working directory. Scope: local bookworm: resolved bullseye: resolved forky: resolved sid: resolved trixie: resolved

CVE-2015-5309 [MEDIUM] CVE-2015-5309: putty - Integer overflow in the terminal emulator in PuTTY before 0.66 allows remote att... Integer overflow in the terminal emulator in PuTTY before 0.66 allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via an ECH (erase characters) escape sequence with a large parameter value, which triggers a buffer underflow. Scope: local bookworm: resolved (fixed in 0.66-1) bullseye: resolved (fixed in 0.66-1) f

CVE-2015-2157 [LOW] CVE-2015-2157: putty - The (1) ssh2_load_userkey and (2) ssh2_save_userkey functions in PuTTY 0.51 thro... The (1) ssh2_load_userkey and (2) ssh2_save_userkey functions in PuTTY 0.51 through 0.63 do not properly wipe SSH-2 private keys from memory, which allows local users to obtain sensitive information by reading the memory. Scope: local bookworm: resolved (fixed in 0.63-10) bullseye: resolved (fixed in 0.63-10) forky: resolved (fixed in 0.63-10) sid: resolved (fixed in 0.6

CVE-2013-4207 [MEDIUM] CVE-2013-4207: filezilla - Buffer overflow in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cau... Buffer overflow in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) via an invalid DSA signature that is not properly handled during computation of a modular inverse and triggers the overflow during a division by zero by the bignum functionality, a different vulnerability than CVE-2013-4206. Scope: local bookworm: resolve