libidn: Crash when given invalid UTF-8 data on input
Published Sep 7, 2016
7.5
HIGHCVSS 3.0
EPSS 3.88%
Description
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.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
libidn
Will not fix
Red Hat Enterprise Linux 6
libidn
Will not fix
Red Hat Enterprise Linux 7
libidn
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | libidn | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | libidn | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | libidn | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.88% (0.03878) | 89.89th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.91% (0.03910) | 88.90th | v5 (v2026.06.15) |
| Feb 26, 2026 | 2.00% (0.02000) | 83.41th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.50% (0.04502) | 88.39th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.51% (0.00509) | 77.35th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.44% (0.00443) | 74.17th | v3 (v2023.03.01) |
| Jun 29, 2023 | 0.44% (0.00443) | 71.39th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.43% (0.00430) | 70.48th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
References (16)
- http://git.savannah.gnu.org/cgit/libidn.git/commit/?id=1fbee57ef3c72db2206dd87e4162108b2f425555 x_refsource_CONFIRMIssue TrackingPatch
- http://lists.opensuse.org/opensuse-updates/2016-08/msg00005.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-updates/2016-08/msg00098.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://www.debian.org/security/2016/dsa-3658 vendor-advisoryx_refsource_DEBIAN
- http://www.openwall.com/lists/oss-security/2016/07/20/6 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2016/07/21/4 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/92070 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-3068-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2016-6263 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1359145 Issue Tracking
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.gnu.org/archive/html/help-libidn/2016-07/msg00009.html mailing-listx_refsource_MLISTVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-6263
- https://security.gentoo.org/glsa/201908-06 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2016-6263
Change history (0)
No recorded changes yet.