Search/CVE-2016-6263
● CVE — High

CVE-2016-6263

VendorgnuProductlibidnDiscoveredSep 7, 2016UpdatedMay 6, 2026

The stringprep_utf8_nfkc_normalize function in lib/nfkc.c in libidn before 1.33 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via crafted UTF-8 data.

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CVSS v3.1
7.5 HIGH
EPSS
3.88%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 16, 2026 → Sep 23, 2026
● 0.00pp
3.88% → 3.88% over 9 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityNONE
IntegrityNONE
AvailabilityHIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Connections
2 relationships
Timeline
disclosure → media coverage
Sep 7, 2016
Disclosure — published as a CVE record. · last revised by NVD May 6, 2026