CVE-2018-0735

Timing attack against ECDSA signature generation

MEDIUM
5.9
CVSS Score
Published: October 29, 2018 at 01:00 PM UTC
Updated: October 8, 2026 at 10:16 PM UTC
22 products affected across 6 vendorsDebian LinuxUbuntu LinuxMySQL Server· also runs on 1 platform

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Severity
MEDIUM5.9
Exploit prediction
EPSS 5%
SSVC
No known exploit

Description

The OpenSSL ECDSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.1.1a (Affected 1.1.1).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-327

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