What is CVE-2019-11851?

CVE-2019-11851 is a critical-severity vulnerability in Sierrawireless Aleos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2022-12-26.

How severe is CVE-2019-11851?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Sierrawireless Aleos

CVE-2019-11851

The ACENet service in Sierra Wireless ALEOS before 4.4.9, 4.5.x through 4.9.x before 4.9.5, and 4.10.x through 4.13.x before 4.14.0 allows remote attackers to execute arbitrary code via a buffer overflow.

Vulnerability class: Buffer Overflow

Published 2022-12-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (75.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Weakness classification (CWE)

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

References

www.sierrawireless.com/company/security/ (Vendor Advisory)
source.sierrawireless.com/-/media/support_downloads/security-bulletins/pdf/swi-… (Vendor Advisory)

Frequently asked questions

What is CVE-2019-11851?: CVE-2019-11851 is a critical-severity vulnerability in Sierrawireless Aleos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2022-12-26.
How severe is CVE-2019-11851?: Critical severity. CVSS v3 base score is 9.8 out of 10.