CVE-2018-4124
It allows remote attackers to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact via a crafted string containing a certain Telugu character.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.85%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An issue was discovered in certain Apple products. iOS before 11.2.6 is affected. macOS before 10.13.3 Supplemental Update is affected. tvOS before 11.2.6 is affected. watchOS before 4.2.3 is affected. The issue involves the "CoreText" component. It allows remote attackers to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact via a crafted string containing a certain Telugu character.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.85% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- apple/iphone os · apple/mac os x · apple/tvos · apple/watchos
- Source
- product-security@apple.com
EPSS 5.9% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securitytracker.com/id/1040396Third Party Advisory, VDB Entry
- https://nakedsecurity.sophos.com/2018/02/20/apple-fixes-that-1-character-to-crash-your-mac-and-iphone-bug/Third Party Advisory
- https://support.apple.com/HT208534Vendor Advisory
- https://support.apple.com/HT208535Vendor Advisory
- https://support.apple.com/HT208536Vendor Advisory
- https://support.apple.com/HT208537Vendor Advisory
- http://www.securitytracker.com/id/1040396Third Party Advisory, VDB Entry
- https://nakedsecurity.sophos.com/2018/02/20/apple-fixes-that-1-character-to-crash-your-mac-and-iphone-bug/Third Party Advisory
- https://support.apple.com/HT208534Vendor Advisory
- https://support.apple.com/HT208535Vendor Advisory
- https://support.apple.com/HT208536Vendor Advisory
- https://support.apple.com/HT208537Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.