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5 vulnerabilities by PuTTY
CVE-2026-48852 (GCVE-0-2026-48852)
Vulnerability from cvelistv5 – Published: 2026-05-25 20:19 – Updated: 2026-05-26 12:39
VLAI
EPSS
VEX
Summary
PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 12:39 UTC
CWE
- CWE-617 - Reachable Assertion
Assigner
References
Impacted products
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CVE-2026-48851 (GCVE-0-2026-48851)
Vulnerability from cvelistv5 – Published: 2026-05-25 20:16 – Updated: 2026-05-26 12:40
VLAI
EPSS
VEX
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 12:40 UTC
CWE
- CWE-451 - User Interface (UI) Misrepresentation of Critical Information
Assigner
References
Impacted products
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CVE-2026-48850 (GCVE-0-2026-48850)
Vulnerability from cvelistv5 – Published: 2026-05-25 20:13 – Updated: 2026-05-26 12:59
VLAI
EPSS
VEX
Summary
PuTTY 0.72 before 0.84 has a double free in RSA KEX.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 12:59 UTC
CWE
- CWE-415 - Double Free
Assigner
References
Impacted products
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CVE-2024-31497 (GCVE-0-2024-31497)
Vulnerability from cvelistv5 – Published: 2024-04-15 00:00 – Updated: 2025-11-04 22:06
VLAI
EPSS
VEX
Summary
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 because they are stored in a public Git service that supports use of SSH for commit signing, and the signatures were made by Pageant through an agent-forwarding mechanism. In other words, an adversary may already have enough signature information to compromise a victim's private key, even if there is no further use of vulnerable PuTTY versions. After a key compromise, an adversary may be able to conduct supply-chain attacks on software maintained in Git. A second, independent scenario is that the adversary is an operator of an SSH server to which the victim authenticates (for remote login or file copy), even though this server is not fully trusted by the victim, and the victim uses the same private key for SSH connections to other services operated by other entities. Here, the rogue server operator (who would otherwise have no way to determine the victim's private key) can derive the victim's private key, and then use it for unauthorized access to those other services. If the other services include Git services, then again it may be possible to conduct supply-chain attacks on software maintained in Git. This also affects, for example, FileZilla before 3.67.0, WinSCP before 6.3.3, TortoiseGit before 2.15.0.1, and TortoiseSVN through 1.14.6.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-19 04:01 UTC
CWE
- n/a
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
32 references
Impacted products
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"value": "In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user\u0027s 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 because they are stored in a public Git service that supports use of SSH for commit signing, and the signatures were made by Pageant through an agent-forwarding mechanism. In other words, an adversary may already have enough signature information to compromise a victim\u0027s private key, even if there is no further use of vulnerable PuTTY versions. After a key compromise, an adversary may be able to conduct supply-chain attacks on software maintained in Git. A second, independent scenario is that the adversary is an operator of an SSH server to which the victim authenticates (for remote login or file copy), even though this server is not fully trusted by the victim, and the victim uses the same private key for SSH connections to other services operated by other entities. Here, the rogue server operator (who would otherwise have no way to determine the victim\u0027s private key) can derive the victim\u0027s private key, and then use it for unauthorized access to those other services. If the other services include Git services, then again it may be possible to conduct supply-chain attacks on software maintained in Git. This also affects, for example, FileZilla before 3.67.0, WinSCP before 6.3.3, TortoiseGit before 2.15.0.1, and TortoiseSVN through 1.14.6."
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"url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-p521-bias.html"
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"url": "https://www.openwall.com/lists/oss-security/2024/04/15/6"
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"url": "https://tartarus.org/~simon/putty-snapshots/htmldoc/Chapter9.html#pageant-forward"
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"url": "https://docs.ccv.brown.edu/oscar/connecting-to-oscar/ssh/ssh-agent-forwarding/key-generation-and-agent-forwarding-with-putty"
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"url": "https://news.ycombinator.com/item?id=40044665"
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{
"url": "https://winscp.net/eng/news.php"
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{
"url": "https://tortoisegit.org"
},
{
"url": "https://github.com/advisories/GHSA-6p4c-r453-8743"
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{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2275183"
},
{
"url": "https://bugzilla.suse.com/show_bug.cgi?id=1222864"
},
{
"url": "https://security-tracker.debian.org/tracker/CVE-2024-31497"
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{
"url": "https://twitter.com/lambdafu/status/1779969509522133272"
},
{
"url": "https://git.tartarus.org/?h=c193fe9848f50a88a4089aac647fecc31ae96d27\u0026p=simon/putty.git"
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{
"url": "https://www.reddit.com/r/sysadmin/comments/1c4wmoj/putty_vulnerability_affecting_v068_to_v08/"
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{
"url": "https://github.com/daedalus/BreakingECDSAwithLLL"
},
{
"url": "https://www.bleepingcomputer.com/news/security/putty-ssh-client-flaw-allows-recovery-of-cryptographic-private-keys/"
},
{
"url": "https://twitter.com/CCBalert/status/1780229237569470549"
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{
"url": "https://securityonline.info/cve-2024-31497-critical-putty-vulnerability-exposes-private-keys-immediate-action-required/"
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{
"name": "FEDORA-2024-8401d42de6",
"tags": [
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMJH7M663BVO3SY6MFAW2FAZWLLXAPRQ/"
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{
"name": "FEDORA-2024-ff9a2fb31c",
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{
"name": "FEDORA-2024-0489e7ba1e",
"tags": [
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZS3B37GNGWOOV7QU7B7JFK76U4TOP4V/"
},
{
"name": "FEDORA-2024-08a4a5ead8",
"tags": [
"vendor-advisory"
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WFDZBV7ZCAZ6AH3VCQ34SSY7L3J7VZXZ/"
},
{
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PUOTQVGC4DISVHQGSPUYGXO6TLDK65LA/"
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{
"name": "[oss-security] 20240415 CVE-2024-31497: Secret Key Recovery of NIST P-521 Private Keys Through Biased ECDSA Nonces in PuTTY Client",
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CVE-2021-36367 (GCVE-0-2021-36367)
Vulnerability from cvelistv5 – Published: 2021-07-09 00:00 – Updated: 2024-08-04 00:54
VLAI
EPSS
VEX
Summary
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).
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-02-22 20:07 UTC
CWE
- n/a
- CWE-345 - Insufficient Verification of Data Authenticity
Assigner
References
4 references
Impacted products
{
"containers": {
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{
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{
"cpes": [
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],
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"vendor": "putty",
"versions": [
{
"lessThanOrEqual": "0.75",
"status": "affected",
"version": "-",
"versionType": "custom"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
"version": "3.1"
}
},
{
"other": {
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{
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"timestamp": "2024-02-22T20:07:50.029818Z",
"version": "2.0.3"
},
"type": "ssvc"
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}
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"title": "CVE Program Container"
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"cna": {
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