What is CVE-2018-6344?

CVE-2018-6344 is a high-severity vulnerability in Facebook Whatsapp For Android, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2018-12-31.

How severe is CVE-2018-6344?

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

Buffer overflow in Facebook Whatsapp For Android

CVE-2018-6344

A heap corruption in WhatsApp can be caused by a malformed RTP packet being sent after a call is established. The vulnerability can be used to cause denial of service. It affects WhatsApp for Android prior to v2.18.293, WhatsApp for iOS prior to v2.18.93, and WhatsApp for Windows Phone prior to v2.18.172.

Vulnerability class: Buffer Overflow

Published 2018-12-31 · 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: 0.019 (79.9th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Facebook Whatsapp For Android — versions 2.18.293, unspecified
Facebook Whatsapp For iOS — versions 2.18.93, unspecified
Facebook Whatsapp For Windows Phone — versions 2.18.172, unspecified
Whatsapp

Weakness classification (CWE)

References

googleprojectzero.blogspot.com/2018/12/adventures-in-video-conferencing-part-3… (Exploit, Third Party Advisory)
www.securityfocus.com/bid/106365 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-6344?: CVE-2018-6344 is a high-severity vulnerability in Facebook Whatsapp For Android, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2018-12-31.
How severe is CVE-2018-6344?: High severity. CVSS v3 base score is 7.5 out of 10.