How severe is CVE-2019-18931?

CVE-2019-18931 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-18931 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18931?

CVE-2019-18931 affects Western Digital My Cloud Ex2 Ultra Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-18931?

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-2019-18931 published?

CVE-2019-18931 was published on 2019-11-13 and last updated on 2026-06-17.

CVE-2019-18931

CVE-2019-18931 is a high-severity vulnerability in Western Digital My Cloud Ex2 Ultra Firmware with a CVSS 3.x base score of 8.8. 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: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Western Digital My Cloud Ex2 Ultra Firmware
Published: 2019-11-13
Last modified: 2026-06-17

Description

Western Digital My Cloud EX2 Ultra firmware 2.31.195 allows a Buffer Overflow with Extended Instruction Pointer (EIP) control via crafted GET/POST parameters.

Frequently asked questions

What is CVE-2019-18931?: Western Digital My Cloud EX2 Ultra firmware 2.31.195 allows a Buffer Overflow with Extended Instruction Pointer (EIP) control via crafted GET/POST parameters.
How severe is CVE-2019-18931?: CVE-2019-18931 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-18931 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18931?: CVE-2019-18931 affects Western Digital My Cloud Ex2 Ultra Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-18931?: 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-2019-18931 published?: CVE-2019-18931 was published on 2019-11-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:western_digital:my_cloud_ex2_ultra_firmware:2.31.195:*:*:*:*:*:*:*

More vulnerabilities in Western Digital My Cloud Ex2 Ultra Firmware

CVE-2019-9951 — Critical (CVSS 9.8): Western Digital My Cloud, My Cloud Mirror Gen2, My Cloud EX2 Ultra, My Cloud EX2100, My Cloud EX4100, My Cloud DL2100,…
CVE-2018-17153 — Critical (CVSS 9.8): It was discovered that the Western Digital My Cloud device before 2.30.196 is affected by an authentication bypass…
CVE-2019-18930 — High (CVSS 8.8): Western Digital My Cloud EX2 Ultra firmware 2.31.183 allows web users (including guest account) to remotely execute…
CVE-2019-18929 — High (CVSS 8.8): Western Digital My Cloud EX2 Ultra firmware 2.31.183 allows web users (including guest accounts) to remotely execute…

All CVEs affecting Western Digital My Cloud Ex2 Ultra Firmware →

Other CWE-120 (Classic Buffer Overflow) vulnerabilities

CVE-2025-48611 — Critical (CVSS 10.0): In DeviceId of DeviceId.java, there is a possible desync in persistence due to a missing bounds check. This could lead…
CVE-2026-24823 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in FASTSHIFT…
CVE-2026-24810 — Critical (CVSS 10.0): Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in rethinkdb (src/cjson modules).…
CVE-2026-24800 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in tildearrow…
CVE-2025-9962 — Critical (CVSS 10.0): A buffer overflow vulnerability in Novakon P series allows attackers to gain root permission without prior…
CVE-2010-10016 — Critical (CVSS 10.0): BS.Player version 2.57 (build 1051) contains a vulnerability in its playlist import functionality. When processing .m3u…

Browse all CWE-120 (Classic Buffer Overflow) vulnerabilities →