CVE-2020-11713Public exploitNetwork attack vector

ECC private-key recovery via timing side channel

Published Apr 12, 2020 · Updated Aug 4, 2024

Timing side channel in wolfSSL before 4.4.0 allows attackers to recover ECC signing keys by measuring scalar-multiplication timing. The wc_ecc_mulmod_ex routine in ecc.c performs scalar multiplication with secret-dependent execution and cache behavior instead of keeping operations constant-time and cache-resistant. Exploitation requires repeated ECDSA signing operations and sufficiently precise timing or shared-cache observation; successful analysis discloses the private key.

CVSS severity7.5
High
EPSS probability2.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Timing side channel in wolfSSL before 4.4.0 allows attackers to recover ECC signing keys by measuring scalar-multiplication timing. The wc_ecc_mulmod_ex routine in ecc.c performs scalar multiplication with secret-dependent execution and cache behavior instead of keeping operations constant-time and cache-resistant. Exploitation requires repeated ECDSA signing operations and sufficiently precise timing or shared-cache observation; successful analysis discloses the private key.

The record

CVE
CVE-2020-11713
Published
Apr 12, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-203, CAPEC-189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-203Observable Discrepancy
CAPEC-189Black Box Reverse Engineering

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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