icu: heap overflow via incorrect isolateCount
Published May 25, 2015
7.5
HIGHCVSS 2.0
EPSS 24.31%
Description
The resolveImplicitLevels function in common/ubidi.c in the Unicode Bidirectional Algorithm implementation in ICU4C in International Components for Unicode (ICU) before 55.1 does not properly track directionally isolated pieces of text, which allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly execute arbitrary code via crafted text.
Affected products
No data.
Configuration 1
Configuration 2
- < 55.1
No data.
Red Hat Directory Server 8
icu
Will not fix
Red Hat Enterprise Linux 5
icu
Will not fix
Red Hat Enterprise Linux 6
icu
Will not fix
Red Hat Enterprise Linux 7
icu
Will not fix
Red Hat OpenShift Enterprise 2
icu
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Directory Server 8 | icu | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | icu | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | icu | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | icu | Will not fix | n/a |
| Red Hat OpenShift Enterprise 2 | icu | 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.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:P/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 (21 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 24.31% (0.24310) | 97.80th | v5 (v2026.06.15) |
| Jun 15, 2026 | 24.29% (0.24286) | 97.57th | v5 (v2026.06.15) |
| May 9, 2026 | 25.81% (0.25808) | 96.30th | v4 (v2025.03.14) |
| May 7, 2026 | 22.74% (0.22738) | 95.90th | v4 (v2025.03.14) |
| Nov 26, 2025 | 25.81% (0.25808) | 96.04th | v4 (v2025.03.14) |
| Nov 9, 2025 | 44.91% (0.44910) | 97.42th | v4 (v2025.03.14) |
| Oct 16, 2025 | 33.76% (0.33764) | 96.72th | v4 (v2025.03.14) |
| Jul 16, 2025 | 40.13% (0.40134) | 97.18th | v4 (v2025.03.14) |
| Jul 12, 2025 | 42.51% (0.42507) | 97.31th | v4 (v2025.03.14) |
| Jun 4, 2025 | 36.98% (0.36980) | 96.94th | v4 (v2025.03.14) |
| May 25, 2025 | 53.76% (0.53757) | 97.83th | v4 (v2025.03.14) |
| Mar 30, 2025 | 44.64% (0.44640) | 97.30th | v4 (v2025.03.14) |
| Mar 29, 2025 | 56.45% (0.56451) | 97.27th | v4 (v2025.03.14) |
| Mar 17, 2025 | 44.64% (0.44640) | 97.27th | v4 (v2025.03.14) |
| Dec 17, 2024 | 3.47% (0.03471) | 91.36th | v3 (v2023.03.01) |
| Dec 12, 2024 | 1.50% (0.01502) | 87.46th | v3 (v2023.03.01) |
| Apr 10, 2024 | 1.06% (0.01063) | 83.91th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.06% (0.01063) | 81.90th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.69% (0.05689) | 90.29th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.69% (0.05689) | 89.34th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.69% (0.05689) | 76.90th | v2 (v2022.01.01) |
References (23)
- http://bugs.icu-project.org/trac/changeset/37162 x_refsource_CONFIRMIssue TrackingVendor Advisory
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html vendor-advisoryx_refsource_APPLEMailing List
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00003.html vendor-advisoryx_refsource_APPLEMailing List
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00005.html vendor-advisoryx_refsource_APPLEMailing List
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html vendor-advisoryx_refsource_APPLEMailing List
- http://openwall.com/lists/oss-security/2015/05/05/6 mailing-listx_refsource_MLISTMailing List
- http://seclists.org/fulldisclosure/2015/May/14 mailing-listx_refsource_FULLDISCExploitMailing ListThird Party Advisory
- http://www.debian.org/security/2015/dsa-3323 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.kb.cert.org/vuls/id/602540 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html x_refsource_CONFIRMThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html x_refsource_CONFIRMPatch
- http://www.securityfocus.com/bid/74457 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2014-8146 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1176197 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2014-8146
- https://raw.githubusercontent.com/pedrib/PoC/master/generic/i-c-u-fail.txt x_refsource_MISCExploit
- https://security.gentoo.org/glsa/201507-04 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://support.apple.com/HT205212 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/HT205213 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/HT205221 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/HT205267 x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2014-8146
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html x_refsource_MISC
Change history (0)
No recorded changes yet.