CVE-2021-36367
Last modified
CVE-2021-36367 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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).. EPSS estimates a 1.11% chance of exploitation in the next 30 days.
Description
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).
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Putty | Putty | <= 0.75 |
References
- https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.htmlRelease Notes, Third Party Advisory
- https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.htmlRelease Notes, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-36367?
How severe is CVE-2021-36367?
How do I fix CVE-2021-36367?
How Strix Helps
- Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-36359OrbiTeam BSCW Classic before 7.4.3 allows exportpdf authenti…8.8
- CVE-2021-3636It was found in OpenShift, before version 4.8, that the gene…4.6
- CVE-2021-36363Nagios XI before 5.8.5 has Incorrect Permission Assignment f…9.8
- CVE-2021-36364Nagios XI before 5.8.5 incorrectly allows backup_xi.sh wildc…9.8
- CVE-2021-36365Nagios XI before 5.8.5 has Incorrect Permission Assignment f…9.8
- CVE-2021-36366Nagios XI before 5.8.5 incorrectly allows manage_services.sh…9.8
- CVE-2021-36368An issue was discovered in OpenSSH before 8.9. If a client i…3.7
- CVE-2021-36369An issue was discovered in Dropbear through 2020.81. Due to …7.5
- CVE-2021-3637A flaw was found in keycloak-model-infinispan in keycloak ve…7.5
- CVE-2021-36370An issue was discovered in Midnight Commander through 4.8.26…7.5
- CVE-2021-36371Emissary-Ingress (formerly Ambassador API Gateway) through 1…3.7
- CVE-2021-36372In Apache Ozone versions prior to 1.2.0, Initially generated…9.8
Are you affected by CVE-2021-36367?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST