CVE-2019-13627 — It was discovered that there was a ECDSA timing attack in the libgcrypt20 crypto

It was discovered that there was a ECDSA timing attack in the libgcrypt20 cryptographic library. Version affected: 1.8.4-5, 1.7.6-2+deb9u3, and 1.6.3-2+deb8u4. Versions fixed: 1.8.5-2 and 1.6.3-2+deb8u7.

01What is this vulnerability?

It was discovered that there was a ECDSA timing attack in the libgcrypt20 cryptographic library. Version affected: 1.8.4-5, 1.7.6-2+deb9u3, and 1.6.3-2+deb8u4. Versions fixed: 1.8.5-2 and 1.6.3-2+deb8u7.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-09-25T15:15:11.877
• Last modified: 2026-10-14T07:16:46.647

09References

• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00060.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00018.html
• www.openwall.com — http://www.openwall.com/lists/oss-security/2019/10/02/2
• github.com — https://github.com/gpg/libgcrypt/releases/tag/libgcrypt-1.8.5
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/09/msg00024.html
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/01/msg00001.html
• minerva.crocs.fi.muni.cz — https://minerva.crocs.fi.muni.cz/
• security-tracker.debian.org — https://security-tracker.debian.org/tracker/CVE-2019-13627
• security.gentoo.org — https://security.gentoo.org/glsa/202003-32
• usn.ubuntu.com — https://usn.ubuntu.com/4236-1/