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-2019-17067 | Cri | 0.64 | 9.8 | 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-2019-9898 | Cri | 0.64 | 9.8 | 0.04 | Mar 21, 2019 | Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71. | ||
| CVE-2019-9895 | Cri | 0.64 | 9.8 | 0.03 | Mar 21, 2019 | In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding. | ||
| CVE-2021-36367 | Hig | 0.53 | 8.1 | 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-2019-9896 | Hig | 0.51 | 7.8 | 0.01 | Mar 21, 2019 | 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. | ||
| 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-2021-33500 | Hig | 0.49 | 7.5 | 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-2019-17069 | Hig | 0.49 | 7.5 | 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-2019-17068 | Hig | 0.49 | 7.5 | 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-2019-9897 | Hig | 0.49 | 7.5 | 0.03 | Mar 21, 2019 | Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71. | ||
| CVE-2019-9894 | Hig | 0.49 | 7.5 | 0.02 | Mar 21, 2019 | A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification. | ||
| CVE-2024-31497 | Med | 0.39 | 5.9 | 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-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-2020-14002 | Med | 0.39 | 5.9 | 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-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. |
- 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 0.64cvss 9.8epss 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.
- risk 0.64cvss 9.8epss 0.04
Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71.
- risk 0.64cvss 9.8epss 0.03
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.
- risk 0.53cvss 8.1epss 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…
- risk 0.51cvss 7.8epss 0.01
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.
- 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 0.49cvss 7.5epss 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…
- risk 0.49cvss 7.5epss 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.
- risk 0.49cvss 7.5epss 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.
- risk 0.49cvss 7.5epss 0.03
Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71.
- risk 0.49cvss 7.5epss 0.02
A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification.
- risk 0.39cvss 5.9epss 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…
- 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 0.39cvss 5.9epss 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).
- 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.
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