Y2Y2
Explore more on Y2
Public vulnerability disclosure
Investigate in Cyber
Open

CVE-2024-13176

Timing side-channel in ECDSA signature computation

publishedCWE-385

Issue summary: A timing side-channel which could potentially allow recovering the private key exists in the ECDSA signature computation. Impact summary: A timing side-channel in ECDSA signature computations could allow recovering the private key by an attacker. However, measuring the timing would require either local access to the signing application or a very fast network connection with low latency. There is a timing signal of around 300 nanoseconds when the top word of the inverted ECDSA nonce value is zero. This can happen with significant probability only for some of the supported elliptic curves. In particular the NIST P-521 curve is affected. To be able to measure this leak, the attacker process must either be located in the same physical computer or must have a very fast network connection with low latency. For that reason the severity of this vulnerability is Low. The FIPS modules in 3.4, 3.3, 3.2, 3.1 and 3.0 are affected by this issue.

Technical severity4.6 mediumCVSS 3.1 · ADP: CISA-ADP
Published2025-01-20Source updated 2026-11-06
Collected2026-11-063 attributed sources

Fixes and workarounds

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: openssl

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: openssl

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: openssl

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: openssl

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: openssl

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: openssl

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: openssl

Affected products and versions

ProductVersionsAuthority
OpenSSL
OpenSSL 		≥ 3.4.0; < 3.4.1 (affected, semver)
≥ 3.3.0; < 3.3.3 (affected, semver)
≥ 3.2.0; < 3.2.4 (affected, semver)
≥ 3.1.0; < 3.1.8 (affected, semver)
≥ 3.0.0; < 3.0.16 (affected, semver)
≥ 1.1.1; < 1.1.1zb (affected, custom)
≥ 1.0.2; < 1.0.2zl (affected, custom)
Other versions: unaffected 		CNA: openssl

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

Version / scoreVectorAuthority
3.1 / 4.6
medium		 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NADP: CISA-ADP
3.1 / 4.1
medium		 CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:LNVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

For agents and automation

Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.

Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.

Get an API keyUse x402Connect an agent
Endpoints and access details

https://api.y2.dev/api/v2/cyber/cves
https://api.y2.dev/api/v2/cyber/cves/{cveId}

A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.

For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.

Agent access JSON · OpenAPI · CVE API guide