How severe is CVE-2011-1945?

CVE-2011-1945 has a CVSS 2.0 base score of 2.6, rated low severity.

Is CVE-2011-1945 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1945?

CVE-2011-1945 primarily affects Openssl. In total, 78 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1945?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-1945 published?

CVE-2011-1945 was published on 2011-05-31 and last updated on 2026-06-16.

CVE-2011-1945

CVE-2011-1945 is a low-severity vulnerability in Openssl with a CVSS 2.0 base score of 2.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

Severity: Low (CVSS 2.0 base score 2.6)
EPSS exploit prediction: 3% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Openssl
Published: 2011-05-31
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2011-1945?: 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.
How severe is CVE-2011-1945?: CVE-2011-1945 has a CVSS 2.0 base score of 2.6, rated low severity.
Is CVE-2011-1945 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1945?: CVE-2011-1945 primarily affects Openssl. In total, 78 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1945?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1945 published?: CVE-2011-1945 was published on 2011-05-31 and last updated on 2026-06-16.

References

Affected products (78)

cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.1c:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.2b:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.3:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.3a:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.4:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.5:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.5:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.5:beta2:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.5a:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.5a:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.5a:beta2:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6:beta2:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6:beta3:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6a:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6a:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6a:beta2:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6a:beta3:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6b:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6c:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6d:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6e:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6f:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6g:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6h:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6i:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6j:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6k:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6l:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.6m:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7:beta1:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7:beta2:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7:beta3:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7:beta4:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7:beta5:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7:beta6:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7a:*:*:*:*:*:*:*

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Other CWE-310 (Cryptographic Issues) vulnerabilities

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CVE-2013-0137 — Critical (CVSS 10.0): The default configuration of the Digital Alert Systems DASDEC EAS device before 2.0-2 and the Monroe Electronics R189…
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Browse all CWE-310 (Cryptographic Issues) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

222.99.52.202 (ipv4-addr)
121.164.135.251 (ipv4-addr)
90.160.135.217 (ipv4-addr)
62.36.19.42 (ipv4-addr)
62.36.19.41 (ipv4-addr)
47.92.90.255 (ipv4-addr)
171.100.156.38 (ipv4-addr)