What is CVE-2019-20423?

CVE-2019-20423 is a high-severity vulnerability in Lustre, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2020-01-27.

How severe is CVE-2019-20423?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Lustre

CVE-2019-20423

In the Lustre file system before 2.12.3, the ptlrpc module has a buffer overflow and panic due to the lack of validation for specific fields of packets sent by a client. The function target_handle_connect() mishandles a certain size value when a client connects to a server, because of an integer signedness error.

Vulnerability class: Buffer Overflow

Published 2020-01-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.024 (83.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.024 · change: +0.003

Affected products

Lustre

Weakness classification (CWE)

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

References

jira.whamcloud.com/browse/LU-12605 (Exploit, Third Party Advisory)
review.whamcloud.com/ (Third Party Advisory)
wiki.lustre.org/Lustre_2.12.3_Changelog (Release Notes, Vendor Advisory)
lustre.org/ (Product, Vendor Advisory)

Frequently asked questions

What is CVE-2019-20423?: CVE-2019-20423 is a high-severity vulnerability in Lustre, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2020-01-27.
How severe is CVE-2019-20423?: High severity. CVSS v3 base score is 7.5 out of 10.