What is CVE-2019-9677?

CVE-2019-9677 is a critical-severity vulnerability in Dahuasecurity Ipc-Hdbw4x2x, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2019-09-18.

How severe is CVE-2019-9677?

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

Buffer overflow in Dahuasecurity Ipc-Hdbw4x2x

CVE-2019-9677

The specific fields of CGI interface of some Dahua products are not strictly verified, an attacker can cause a buffer overflow by constructing malicious packets. Affected products include: IPC-HDW1X2X,IPC-HFW1X2X,IPC-HDW2X2X,IPC-HFW2X2X,IPC-HDW4X2X,IPC-HFW4X2X,IPC-HDBW4X2X,IPC-HDW5X2X,IPC-HFW5X2X for versions which Build time is before August 18, 2019.

Vulnerability class: Buffer Overflow

Published 2019-09-18 · 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: 0.011 (65.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.4% 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-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.dahuasecurity.com/support/cybersecurity/details/637 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2019-9677?: CVE-2019-9677 is a critical-severity vulnerability in Dahuasecurity Ipc-Hdbw4x2x, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2019-09-18.
How severe is CVE-2019-9677?: Critical severity. CVSS v3 base score is 9.8 out of 10.