How severe is CVE-2019-20423?

CVE-2019-20423 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-20423 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20423?

CVE-2019-20423 affects Lustre. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-20423?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-20423 published?

CVE-2019-20423 was published on 2020-01-27 and last updated on 2026-06-17.

CVE-2019-20423

CVE-2019-20423 is a high-severity vulnerability in Lustre with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Lustre
Published: 2020-01-27
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2019-20423?: CVE-2019-20423 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-20423 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20423?: CVE-2019-20423 affects Lustre. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-20423?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-20423 published?: CVE-2019-20423 was published on 2020-01-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lustre:lustre:*:*:*:*:*:*:*:*

More vulnerabilities in Lustre

CVE-2019-20427 — Critical (CVSS 9.8): In the Lustre file system before 2.12.3, the ptlrpc module has a buffer overflow and panic, and possibly remote code…
CVE-2019-20432 — High (CVSS 7.5): In the Lustre file system before 2.12.3, the mdt module has an out-of-bounds access and panic due to the lack of…
CVE-2019-20431 — High (CVSS 7.5): In the Lustre file system before 2.12.3, the ptlrpc module has an osd_map_remote_to_local out-of-bounds access and…
CVE-2019-20430 — High (CVSS 7.5): In the Lustre file system before 2.12.3, the mdt module has an LBUG panic (via a large MDT Body eadatasize field) due…
CVE-2019-20429 — High (CVSS 7.5): In the Lustre file system before 2.12.3, the ptlrpc module has an out-of-bounds read and panic (via a modified…
CVE-2019-20428 — High (CVSS 7.5): In the Lustre file system before 2.12.3, the ptlrpc module has an out-of-bounds read and panic due to the lack of…

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