What is CVE-2021-25847?

CVE-2021-25847 is a critical-severity vulnerability in Moxa Vport 06ec-2v26m, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2021-05-10.

How severe is CVE-2021-25847?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Out-of-bounds Read in Moxa Vport 06ec-2v26m

CVE-2021-25847

Improper validation of the length field of LLDP-MED TLV in userdisk/vport_lldpd in Moxa Camera VPort 06EC-2V Series, version 1.1, allows information disclosure to attackers due to controllable loop counter variable via a crafted lldp packet.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

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-2021-25847?: CVE-2021-25847 is a critical-severity vulnerability in Moxa Vport 06ec-2v26m, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2021-05-10.
How severe is CVE-2021-25847?: Critical severity. CVSS v3 base score is 9.1 out of 10.