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By the Year

In 2022 there have been 0 vulnerabilities in Putty . Last year Putty had 1 security vulnerability published. Right now, Putty is on track to have less security vulnerabilities in 2022 than it did last year.

Year Vulnerabilities Average Score
2022 0 0.00
2021 1 8.10
2020 1 5.90
2019 5 7.96
2018 0 0.00

It may take a day or so for new Putty vulnerabilities to show up in the stats or in the list of recent security vulnerabilties. Additionally vulnerabilities may be tagged under a different product or component name.

Recent Putty Security Vulnerabilities

PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response

CVE-2021-36367 8.1 - High - July 09, 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 credential data, and use that data for purposes that are undesired by the client user).

Insufficient Verification of Data Authenticity

PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in the algorithm negotiation

CVE-2020-14002 5.9 - Medium - June 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).

Side Channel Attack

PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, which may

CVE-2019-17068 7.5 - High - October 01, 2019

PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, which may allow a session to be affected by malicious clipboard content.

Injection

PuTTY before 0.73 might

CVE-2019-17069 7.5 - High - October 01, 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.

Dangling pointer

A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71

CVE-2019-9894 7.5 - High - March 21, 2019

A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification.

Key Management Errors

Multiple denial-of-service attacks

CVE-2019-9897 7.5 - High - March 21, 2019

Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71.

Improper Input Validation

Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71.

CVE-2019-9898 9.8 - Critical - March 21, 2019

Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71.

Use of a Broken or Risky Cryptographic Algorithm

Multiple untrusted search path vulnerabilities in Putty beta 0.67

CVE-2016-6167 7.8 - High - January 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.

Untrusted Path

Integer overflow in PuTTY 0.62 and earlier, WinSCP before 5.1.6, and other products

CVE-2013-4852 - August 19, 2013

Integer overflow in PuTTY 0.62 and earlier, WinSCP before 5.1.6, and other products that use PuTTY allows remote SSH servers to cause a denial of service (crash) and possibly execute arbitrary code in certain applications that use PuTTY via a negative size value in an RSA key signature during the SSH handshake, which triggers a heap-based buffer overflow.

Numeric Errors

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

CVE-2013-4207 - August 19, 2013

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.

Buffer Overflow

Heap-based buffer underflow in the modmul function in sshbn.c in PuTTY before 0.63

CVE-2013-4206 - August 19, 2013

Heap-based buffer underflow in the modmul function in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) and possibly trigger memory corruption or code execution via a crafted DSA signature, which is not properly handled when performing certain bit-shifting operations during modular multiplication.

Buffer Overflow

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