What is CVE-2023-34933?

CVE-2023-34933 is a high-severity vulnerability in H3c Magic B1st, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2023-06-28.

How severe is CVE-2023-34933?

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

Buffer overflow in H3c Magic B1st

CVE-2023-34933

A stack overflow in the UpdateWanParams function of H3C Magic B1STV100R012 allows attackers to cause a Denial of Service (DoS) via a crafted POST request.

Vulnerability class: Buffer Overflow

Published 2023-06-28 · 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: 0.008 (56.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

H3c Magic B1st
H3c Magic B1st Firmware — versions 100r012

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/h4kuy4/vuln/blob/main/H3C_B1STW/CVE-2023-34933.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-34933?: CVE-2023-34933 is a high-severity vulnerability in H3c Magic B1st, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2023-06-28.
How severe is CVE-2023-34933?: High severity. CVSS v3 base score is 7.5 out of 10.