How severe is CVE-2019-20427?

CVE-2019-20427 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-20427 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20427?

CVE-2019-20427 affects Lustre. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-20427?

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

When was CVE-2019-20427 published?

CVE-2019-20427 was published on 2020-01-27 and last updated on 2026-06-17.

CVE-2019-20427

CVE-2019-20427 is a critical-severity vulnerability in Lustre with a CVSS 3.x base score of 9.8. 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: Critical (CVSS 3.x base score 9.8)
CVSS v2: 9.0
EPSS exploit prediction: 5% (91st 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, and possibly remote code execution, due to the lack of validation for specific fields of packets sent by a client. Interaction between req_capsule_get_size and tgt_brw_write leads to a tgt_shortio2pages integer signedness error.

Frequently asked questions

What is CVE-2019-20427?: In the Lustre file system before 2.12.3, the ptlrpc module has a buffer overflow and panic, and possibly remote code execution, due to the lack of validation for specific fields of packets sent by a client. Interaction between req_capsule_get_size and tgt_brw_write leads to a tgt_shortio2pages integer signedness error.
How severe is CVE-2019-20427?: CVE-2019-20427 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-20427 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20427?: CVE-2019-20427 affects Lustre. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-20427?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-20427 published?: CVE-2019-20427 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-2019-20432 — 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…
CVE-2019-20426 — High (CVSS 7.5): In the Lustre file system before 2.12.3, the ptlrpc module has an out-of-bounds access and panic due to the lack of…

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