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CVE-2011-1945

15
FAUCET Score

CVE-2011-1945 describes a timing attack vulnerability in the Elliptic Curve Cryptography (ECC) subsystem of OpenSSL versions 1.0.0d and earlier, specifically when using ECDSA with the ECDHE_ECDSA cipher suite. This flaw, rated with a CVSS score of 2.6 (low severity), allows remote attackers to potentially determine private keys due to improper implementation of curves over binary fields. While the attack complexity is high, successful exploitation could lead to the compromise of sensitive cryptographic keys. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.0.0dCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
0.9.1cCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.1c:*:*:*:*:*:*:*
0.9.2bCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.2b:*:*:*:*:*:*:*
0.9.3CPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.3:*:*:*:*:*:*:*
0.9.3aCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:0.9.3a:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.6LOW

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

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.43%
Probability of exploitation in next 30 days
EPSS Percentile
87.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0343 is in the 86th percentile among its peer group of 1,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.3 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2011-1945Important

openssl: ECDSA private key leak through a remote timing attack

May 17, 2011

References

eprint.iacr.org / 2011/232.pdf
Exploit
lists.apple.com / archives/security-announce/2013/Jun/msg00000.html
secunia.com / advisories/44935
hermes.opensuse.org / messages/8760466
hermes.opensuse.org / messages/8764170
support.apple.com / kb/HT5784
debian.org / security/2011/dsa-2309
kb.cert.org / vuls/id/536044
US Government Resource
kb.cert.org / vuls/id/MAPG-8FENZ3
US Government Resource
mandriva.com / security/advisories
mandriva.com / security/advisories