Putty
by Putty
Source repositories
CVEs (38)
| CVE | Vendor / Product | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|---|
| CVE-2016-2563 | Cri | 0.69 | 9.8 | 0.34 | Apr 7, 2016 | 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… | ||
| CVE-2017-6542 | Cri | 0.68 | 9.8 | 0.22 | Mar 27, 2017 | 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… | ||
| CVE-2016-6167 | Hig | 0.51 | 7.8 | 0.01 | Jan 30, 2017 | 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. | ||
| CVE-2023-48795 | Med | 0.39 | 5.9 | 0.93 | Dec 18, 2023 | 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… | ||
| CVE-2026-48852 | Low | 0.24 | 3.7 | 0.00 | May 25, 2026 | PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification. | ||
| CVE-2026-48850 | Low | 0.24 | 3.7 | 0.00 | May 25, 2026 | PuTTY 0.72 before 0.84 has a double free in RSA KEX. | ||
| CVE-2026-4115 | Low | 0.24 | 3.7 | 0.01 | Mar 22, 2026 | 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… | ||
| CVE-2026-48851 | Low | 0.20 | 3.1 | 0.00 | May 25, 2026 | PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session. | ||
| CVE-2002-1359 | 0.09 | — | 0.80 | Dec 23, 2002 | Multiple SSH2 servers and clients do not properly handle large packets or large fields, which may allow remote attackers to cause a denial of service or possibly execute arbitrary code via buffer overflow attacks, as demonstrated by the SSHredder SSH protocol test suite. | |||
| CVE-2000-0476 | 0.03 | — | 0.03 | Jun 1, 2000 | xterm, Eterm, and rxvt allow an attacker to cause a denial of service by embedding certain escape characters which force the window to be resized. | |||
| CVE-2024-31497 | 0.02 | — | 0.06 | Apr 15, 2024 | 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… | |||
| CVE-2004-1008 | 0.01 | — | 0.07 | Jan 10, 2005 | Integer signedness error in the ssh2_rdpkt function in PuTTY before 0.56 allows remote attackers to execute arbitrary code via a SSH2_MSG_DEBUG packet with a modified stringlen parameter, which leads to a buffer overflow. | |||
| CVE-2002-1357 | 0.01 | — | 0.10 | Dec 23, 2002 | Multiple SSH2 servers and clients do not properly handle packets or data elements with incorrect length specifiers, which may allow remote attackers to cause a denial of service or possibly execute arbitrary code, as demonstrated by the SSHredder SSH protocol test suite. | |||
| CVE-2021-36367 | 0.00 | — | 0.01 | Jul 9, 2021 | 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… | |||
| CVE-2021-33500 | 0.00 | — | 0.02 | May 21, 2021 | 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… | |||
| CVE-2020-14002 | 0.00 | — | 0.03 | Jun 29, 2020 | 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). | |||
| CVE-2019-17067 | 0.00 | — | 0.02 | Oct 1, 2019 | 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. | |||
| CVE-2019-17068 | 0.00 | — | 0.02 | Oct 1, 2019 | PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, which may allow a session to be affected by malicious clipboard content. | |||
| CVE-2019-17069 | 0.00 | — | 0.02 | Oct 1, 2019 | 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. | |||
| CVE-2019-9898 | 0.00 | — | 0.04 | Mar 21, 2019 | Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71. |
- risk 0.69cvss 9.8epss 0.34
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…
- risk 0.68cvss 9.8epss 0.22
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…
- risk 0.51cvss 7.8epss 0.01
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.
- risk 0.39cvss 5.9epss 0.93
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…
- risk 0.24cvss 3.7epss 0.00
PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.
- risk 0.24cvss 3.7epss 0.00
PuTTY 0.72 before 0.84 has a double free in RSA KEX.
- risk 0.24cvss 3.7epss 0.01
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…
- risk 0.20cvss 3.1epss 0.00
PuTTY 0.77 before 0.84 uses a copy of the PuTTY icon as a trust indication for TELNET data but the trust status is not cleared between proxy authentication and the main session.
- CVE-2002-1359Dec 23, 2002risk 0.09cvss —epss 0.80
Multiple SSH2 servers and clients do not properly handle large packets or large fields, which may allow remote attackers to cause a denial of service or possibly execute arbitrary code via buffer overflow attacks, as demonstrated by the SSHredder SSH protocol test suite.
- CVE-2000-0476Jun 1, 2000risk 0.03cvss —epss 0.03
xterm, Eterm, and rxvt allow an attacker to cause a denial of service by embedding certain escape characters which force the window to be resized.
- CVE-2024-31497Apr 15, 2024risk 0.02cvss —epss 0.06
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…
- CVE-2004-1008Jan 10, 2005risk 0.01cvss —epss 0.07
Integer signedness error in the ssh2_rdpkt function in PuTTY before 0.56 allows remote attackers to execute arbitrary code via a SSH2_MSG_DEBUG packet with a modified stringlen parameter, which leads to a buffer overflow.
- CVE-2002-1357Dec 23, 2002risk 0.01cvss —epss 0.10
Multiple SSH2 servers and clients do not properly handle packets or data elements with incorrect length specifiers, which may allow remote attackers to cause a denial of service or possibly execute arbitrary code, as demonstrated by the SSHredder SSH protocol test suite.
- CVE-2021-36367Jul 9, 2021risk 0.00cvss —epss 0.01
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…
- CVE-2021-33500May 21, 2021risk 0.00cvss —epss 0.02
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…
- CVE-2020-14002Jun 29, 2020risk 0.00cvss —epss 0.03
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).
- CVE-2019-17067Oct 1, 2019risk 0.00cvss —epss 0.02
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.
- CVE-2019-17068Oct 1, 2019risk 0.00cvss —epss 0.02
PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, which may allow a session to be affected by malicious clipboard content.
- CVE-2019-17069Oct 1, 2019risk 0.00cvss —epss 0.02
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.
- CVE-2019-9898Mar 21, 2019risk 0.00cvss —epss 0.04
Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71.
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