CVE-2011-0539

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Summary

CVECVE-2011-0539
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2011-02-10 18:00:57 UTC
Updated2026-05-29 21:16:24 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.020750000 probability, percentile 0.842650000 (date 2026-06-03)

Problem Types: CWE-264 | CWE-457 | n/a | CWE-457 CWE-457 Use of Uninitialized Variable

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None

AV:N/AC:L/Au:N/C:P/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Openbsd Openssh 5.6 All All All
Application Openbsd Openssh 5.7 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
oss-security - Re: [vendor-sec] OpenSSH security advisory: legacy certificate signing in 5.6/5.7 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
OpenSSH Legacy Certificates Stack Memory Leak Weakness - Secunia.com af854a3a-2127-422b-91ae-364da2661108 secunia.com Vendor Advisory
Juniper Networks - 2015-04 Security Bulletin: IDP: Multiple vulnerabilities addressed by third party software updates. af854a3a-2127-422b-91ae-364da2661108 kb.juniper.net
OpenSSH Legacy Certificates May Disclose Stack Contents to Remote Users - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com
OpenSSH Legacy Certificate Signing Information Disclosure Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
IBM X-Force Exchange af854a3a-2127-422b-91ae-364da2661108 exchange.xforce.ibmcloud.com
h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp af854a3a-2127-422b-91ae-364da2661108 h20000.www2.hp.com
www.openssh.com/txt/legacy-cert.adv af854a3a-2127-422b-91ae-364da2661108 www.openssh.com Patch, Vendor Advisory
Webmail : Solution de messagerie professionnelle - OVHcloud- OVH af854a3a-2127-422b-91ae-364da2661108 www.vupen.com Vendor Advisory
HP Insight Control for Linux Multiple Vulnerabilities - Secunia.com af854a3a-2127-422b-91ae-364da2661108 secunia.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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