What is CVE-2021-25846?

CVE-2021-25846 is a high-severity vulnerability in Moxa Vport 06ec-2v26m, classified under Integer Underflow. CVSS score: 7.5/10. Published 2021-05-10.

How severe is CVE-2021-25846?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in Moxa Vport 06ec-2v26m

CVE-2021-25846

Improper validation of the ChassisID TLV in userdisk/vport_lldpd in Moxa Camera VPort 06EC-2V Series, version 1.1, allows attackers to cause a denial of service due to a negative number passed to the memcpy function via a crafted lldp packet.

Published 2021-05-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (62.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

www.moxa.com/en/ (Vendor Advisory)
www.moxa.com/en/support/product-support/security-advisory/vport-06ec-2v-series-… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-25846?: CVE-2021-25846 is a high-severity vulnerability in Moxa Vport 06ec-2v26m, classified under Integer Underflow. CVSS score: 7.5/10. Published 2021-05-10.
How severe is CVE-2021-25846?: High severity. CVSS v3 base score is 7.5 out of 10.