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CVE-2011-0539
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…
High7.5EPSS 1.8%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
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.
Timeline
ID reserved
By redhat
- 21 days later
· 21 days later
Published
- 15 years later
· 15 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 1.8% · top 21% of all CVEs (8 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
n/a
- affected n/a
References (10)
- [oss-security] 20110204 Re: [vendor-sec] OpenSSH security advisory: legacy certificate signing in 5.6/5.7 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 1025028 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- 46155 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673 (opens in a new tab)x_refsource_CONFIRMx_transferred
- ADV-2011-0284 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- 43181 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- HPSBMA02658 (opens in a new tab)vendor-advisoryx_refsource_HPx_transferred
- 44269 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- http://www.openssh.com/txt/legacy-cert.adv (opens in a new tab)x_refsource_CONFIRMx_transferred
- openssh-certificate-info-disclosure(65163) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2011-0539)Record last updated .