What is CVE-2019-16128?

CVE-2019-16128 is a medium-severity vulnerability in Microchip Cryptoauthlib, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.8/10. Published 2020-10-22.

How severe is CVE-2019-16128?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Buffer overflow in Microchip Cryptoauthlib

CVE-2019-16128

Microchip CryptoAuthentication Library CryptoAuthLib prior to 20191122 has a Buffer Overflow (issue 1 of 2).

Vulnerability class: Buffer Overflow

Published 2020-10-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Microchip Cryptoauthlib

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.microchip.com/design-centers/security-ics/cryptoauthentication (Vendor Advisory)
www.openwall.com/lists/oss-security/2020/10/22/1 (mailing-list, Mailing List, Third Party Advisory)
census-labs.com/news/2020/10/21/microchip-cryptoauthlib-atcab_sign_base-buffer-… (Exploit, Third Party Advisory, Press/Media Coverage)

Frequently asked questions

What is CVE-2019-16128?: CVE-2019-16128 is a medium-severity vulnerability in Microchip Cryptoauthlib, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.8/10. Published 2020-10-22.
How severe is CVE-2019-16128?: Medium severity. CVSS v3 base score is 6.8 out of 10.