openssl: ECDSA private key leak through a remote timing attack
Published May 31, 2011
2.6
LOWCVSS 2.0
EPSS 3.29%
Description
The elliptic curve cryptography (ECC) subsystem in OpenSSL 1.0.0d and earlier, when the Elliptic Curve Digital Signature Algorithm (ECDSA) is used for the ECDHE_ECDSA cipher suite, does not properly implement curves over binary fields, which makes it easier for context-dependent attackers to determine private keys via a timing attack and a lattice calculation.
Affected products
No data.
- ≤ 1.0.0d
- 0.9.1c
- 0.9.2b
- 0.9.3
- 0.9.3a
- 0.9.4
- 0.9.5
- 0.9.5
- 0.9.5
- 0.9.5a
- 0.9.5a
- 0.9.5a
- 0.9.6
- 0.9.6
- 0.9.6
- 0.9.6
- 0.9.6a
- 0.9.6a
- 0.9.6a
- 0.9.6a
- 0.9.6b
- 0.9.6c
- 0.9.6d
- 0.9.6e
- 0.9.6f
- 0.9.6g
- 0.9.6h
- 0.9.6i
- 0.9.6j
- 0.9.6k
- 0.9.6l
- 0.9.6m
- 0.9.7
- 0.9.7
- 0.9.7
- 0.9.7
- 0.9.7
- 0.9.7
- 0.9.7
- 0.9.7a
- 0.9.7b
- 0.9.7c
- 0.9.7d
- 0.9.7e
- 0.9.7f
- 0.9.7g
- 0.9.7h
- 0.9.7i
- 0.9.7j
- 0.9.7k
- 0.9.7l
- 0.9.7m
- 0.9.8
- 0.9.8a
- 0.9.8b
- 0.9.8c
- 0.9.8d
- 0.9.8e
- 0.9.8f
- 0.9.8g
- 0.9.8h
- 0.9.8i
- 0.9.8j
- 0.9.8k
- 0.9.8l
- 0.9.8m
- 0.9.8n
- 0.9.8o
- 0.9.8p
- 1.0.0
- 1.0.0
- 1.0.0
- 1.0.0
- 1.0.0
- 1.0.0
- 1.0.0a
- 1.0.0b
- 1.0.0c
No data.
Red Hat Enterprise Linux 4
openssl
Not affected
Red Hat Enterprise Linux 4
openssl096b
Not affected
Red Hat Enterprise Linux 5
openssl
Not affected
Red Hat Enterprise Linux 5
openssl097a
Not affected
Red Hat Enterprise Linux 6
openssl
Not affected
Red Hat Enterprise Linux 6
openssl098e
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | openssl | Not affected | n/a |
| Red Hat Enterprise Linux 4 | openssl096b | Not affected | n/a |
| Red Hat Enterprise Linux 5 | openssl | Not affected | n/a |
| Red Hat Enterprise Linux 5 | openssl097a | Not affected | n/a |
| Red Hat Enterprise Linux 6 | openssl | Not affected | n/a |
| Red Hat Enterprise Linux 6 | openssl098e | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of openssl as shipped with Red Hat Enterprise Linux 3, 4, 5, or 6, as they do not include the support for the elliptic curve cryptography.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:H/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.29% (0.03288) | 88.07th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.43% (0.03430) | 87.36th | v5 (v2026.06.15) |
| Jun 22, 2025 | 4.85% (0.04848) | 89.05th | v4 (v2025.03.14) |
| Mar 30, 2025 | 7.03% (0.07035) | 90.61th | v4 (v2025.03.14) |
| Mar 29, 2025 | 11.29% (0.11289) | 89.18th | v4 (v2025.03.14) |
| Mar 17, 2025 | 7.03% (0.07035) | 90.81th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.43% (0.00433) | 75.39th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.61% (0.00614) | 78.05th | v3 (v2023.03.01) |
| Jun 19, 2023 | 0.61% (0.00614) | 75.75th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.64% (0.00639) | 75.99th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
References (15)
- http://eprint.iacr.org/2011/232.pdf x_refsource_MISCExploit
- http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html vendor-advisoryx_refsource_APPLE
- http://secunia.com/advisories/44935 third-party-advisoryx_refsource_SECUNIA
- http://support.apple.com/kb/HT5784 x_refsource_CONFIRM
- http://www.debian.org/security/2011/dsa-2309 vendor-advisoryx_refsource_DEBIAN
- http://www.kb.cert.org/vuls/id/536044 third-party-advisoryx_refsource_CERT-VNUS Government Resource
- http://www.kb.cert.org/vuls/id/MAPG-8FENZ3 x_refsource_CONFIRMUS Government Resource
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:136 vendor-advisoryx_refsource_MANDRIVA
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:137 vendor-advisoryx_refsource_MANDRIVA
- https://access.redhat.com/security/cve/CVE-2011-1945 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=709021 Issue Tracking
- https://hermes.opensuse.org/messages/8760466 vendor-advisoryx_refsource_SUSE
- https://hermes.opensuse.org/messages/8764170 vendor-advisoryx_refsource_SUSE
- https://nvd.nist.gov/vuln/detail/CVE-2011-1945
- https://www.cve.org/CVERecord?id=CVE-2011-1945
Change history (0)
No recorded changes yet.