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Fencer Vulns
high 7.5

CVE-2018-6344 json

A heap corruption in WhatsApp can be caused by a malformed RTP packet being sent after a call is established.

published 2018-12-31 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-18102

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

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.

Patch / fix

  • Facebook WhatsApp for Android 2.18.293
  • Facebook WhatsApp for iOS 2.18.93
  • Facebook WhatsApp for Windows Phone 2.18.172

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

1.95% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • googleprojectzero.blogspot.com https://googleprojectzero.blogspot.com/2018/12/adventures-in-video-conferencing-part-3.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Facebook WhatsApp for Android
  • Facebook WhatsApp for iOS
  • Facebook WhatsApp for Windows Phone

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.