What is CVE-2019-11849?

CVE-2019-11849 is a medium-severity vulnerability in Sierrawireless Airlink Lx40, classified under Out-of-bounds Write. CVSS score: 6.3/10. Published 2020-08-21.

How severe is CVE-2019-11849?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Buffer overflow in Sierrawireless Airlink Lx40

CVE-2019-11849

A stack overflow vulnerabiltity exists in the AT command APIs of ALEOS before 4.11.0. The vulnerability may allow code execution.

Vulnerability class: Buffer Overflow

Published 2020-08-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

source.sierrawireless.com/resources/security-bulletins/sierra-wireless-technica… (Vendor Advisory)

Frequently asked questions

What is CVE-2019-11849?: CVE-2019-11849 is a medium-severity vulnerability in Sierrawireless Airlink Lx40, classified under Out-of-bounds Write. CVSS score: 6.3/10. Published 2020-08-21.
How severe is CVE-2019-11849?: Medium severity. CVSS v3 base score is 6.3 out of 10.