CVE-2011-0539
HIGH · CVSS 7.5EPSS 1.8%EU EUVD
The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.
Key facts
- CVSS score
- 7.5 (v3.1)
- Severity
- HIGH
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
- CWE-264
- EPSS score
- 1.8% (79th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2011-0557)
- Published
- February 10, 2011
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2011-0557 in the EU Vulnerability Database. Last updated in EUVD on May 29, 2026.
View on the EU Vulnerability DatabaseAffected products
- openbsd / openssh
- openbsd / openssh
References
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673
- http://secunia.com/advisories/43181(Vendor Advisory)
- http://secunia.com/advisories/44269
- http://www.openssh.com/txt/legacy-cert.adv(Patch, Vendor Advisory)
- http://www.openwall.com/lists/oss-security/2011/02/04/2
- http://www.securityfocus.com/bid/46155
- http://www.securitytracker.com/id?1025028
- http://www.vupen.com/english/advisories/2011/0284(Vendor Advisory)
- https://exchange.xforce.ibmcloud.com/vulnerabilities/65163
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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