CVE-2018-20655 json
When receiving calls using WhatsApp for iOS, a missing size check when parsing a sender-provided packet allowed for a stack-based overflow.
published 2019-06-14 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-13206
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.2%
- EPSS 2.2% chance of exploitation in 30 days, percentile 82%
- public exploits
- 0
- none known
Summary
When receiving calls using WhatsApp for iOS, a missing size check when parsing a sender-provided packet allowed for a stack-based overflow. This issue affects WhatsApp for iOS prior to v2.18.90.24 and WhatsApp Business for iOS prior to v2.18.90.24.
Patch / fix
- Facebook WhatsApp for iOS 2.18.90.24
- Facebook WhatsApp Business for iOS 2.18.90.24
Exploit prediction
2.20% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Facebook WhatsApp for iOS
- Facebook WhatsApp Business for iOS
Classification
References
-
facebook.com
/security/advisories/cve-2018-20655/
third-party-advisory
-
securityfocus.com
/bid/108805
vdb-entry, third-party-advisory
Sources
- CVE List CVE-2018-20655
- NVD CVE-2018-20655
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.