What is CVE-2018-15497?

CVE-2018-15497 is a critical-severity vulnerability in Mitel Mivoice 5330e, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-10-23.

How severe is CVE-2018-15497?

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

Buffer overflow in Mitel Mivoice 5330e

CVE-2018-15497

The Mitel MiVoice 5330e VoIP device is affected by memory corruption flaws in the SIP/SDP packet handling functionality. An attacker can exploit this issue remotely, by sending a particular pattern of SIP/SDP packets, to cause a denial of service state in the affected devices and probably remote code execution.

Vulnerability class: Buffer Overflow

Published 2018-10-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.049 (91.8th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.049 · newest: 0.049 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

www.nccgroup.trust/uk/our-research/technical-advisory-mitel-mivoice-5330e-memor… (Exploit, Third Party Advisory)
www.mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory… (Vendor Advisory)

Frequently asked questions

What is CVE-2018-15497?: CVE-2018-15497 is a critical-severity vulnerability in Mitel Mivoice 5330e, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-10-23.
How severe is CVE-2018-15497?: Critical severity. CVSS v3 base score is 9.8 out of 10.