The resolveImplicitLevels function in common/ubidi.c in the Unicode Bidirectional Algorithm implementation in ICU4C in International Compone
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.
- Published
- May 25, 2015
- Updated
- Jun 16, 2026
- EPSS
- 24.3% · 98th percentile
- CWE
- CWE-119
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Report tools
Action score
37
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 7 / 30 · 24.3%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| apple | itunes | cpe:2.3:a:apple:itunes |
| apple | iphone os | cpe:2.3:o:apple:iphone_os |
| apple | mac os x | cpe:2.3:o:apple:mac_os_x |
| apple | watchos | cpe:2.3:o:apple:watchos |
| icu-project | international components for unicode | cpe:2.3:a:icu-project:international_components_for_unicode |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apple iphone osup to 8.2 inclusive
- apple itunesup to 12.1.3 inclusive
- apple mac os xup to 10.10.4 inclusive
- apple watchosup to 1.0.1 inclusive
- icu-project international components for unicodebefore 55.1
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | icu | before 52.1-9 | 52.1-9 |
| Debian:7 | icu | before 4.8.1.1-12+deb7u3 | 4.8.1.1-12+deb7u3 |
| Debian:8 | icu | before 52.1-8+deb8u2 | 52.1-8+deb8u2 |
| openSUSE:Tumbleweed | libreoffice | before 5.2.3.3-2.2 | 5.2.3.3-2.2 |
| SUSE:Linux Enterprise Desktop 12 | apache-commons-logging | before 1.1.3-7.1 | 1.1.3-7.1 |
| SUSE:Linux Enterprise Desktop 12 | cmis-client | before 0.5.0-5.1 | 0.5.0-5.1 |
| SUSE:Linux Enterprise Desktop 12 | flute | before 1.3.0-4.2 | 1.3.0-4.2 |
| SUSE:Linux Enterprise Desktop 12 | graphite2 | before 1.3.1-3.1 | 1.3.1-3.1 |
| SUSE:Linux Enterprise Desktop 12 | hyphen | before 2.8.8-9.1 | 2.8.8-9.1 |
| SUSE:Linux Enterprise Desktop 12 | libabw | before 0.1.1-5.3 | 0.1.1-5.3 |
| SUSE:Linux Enterprise Desktop 12 | libbase | before 1.1.3-4.3 | 1.1.3-4.3 |
| SUSE:Linux Enterprise Desktop 12 | libcdr | before 0.1.1-5.3 | 0.1.1-5.3 |
| SUSE:Linux Enterprise Desktop 12 | libe-book | before 0.1.2-4.2 | 0.1.2-4.2 |
| SUSE:Linux Enterprise Desktop 12 | libetonyek | before 0.1.3-3.5 | 0.1.3-3.5 |
| SUSE:Linux Enterprise Desktop 12 | libfonts | before 1.1.3-4.9 | 1.1.3-4.9 |
| SUSE:Linux Enterprise Desktop 12 | libformula | before 1.1.3-4.3 | 1.1.3-4.3 |
| SUSE:Linux Enterprise Desktop 12 | libfreehand | before 0.1.1-4.9 | 0.1.1-4.9 |
| SUSE:Linux Enterprise Desktop 12 | libgltf | before 0.0.1-2.1 | 0.0.1-2.1 |
| SUSE:Linux Enterprise Desktop 12 | libixion | before 0.9.1-3.1 | 0.9.1-3.1 |
| SUSE:Linux Enterprise Desktop 12 | liblangtag | before 0.5.7-3.1 | 0.5.7-3.1 |
| SUSE:Linux Enterprise Desktop 12 | liblayout | before 0.2.10-4.8 | 0.2.10-4.8 |
| SUSE:Linux Enterprise Desktop 12 | libloader | before 1.1.3-3.2 | 1.1.3-3.2 |
| SUSE:Linux Enterprise Desktop 12 | libmspub | before 0.1.2-5.1 | 0.1.2-5.1 |
| SUSE:Linux Enterprise Desktop 12 | libmwaw | before 0.3.6-3.3 | 0.3.6-3.3 |
+27
Same product
apple: all recordsOther highest-scoring records for the same primary product.
- CVE-2005-0043Buffer overflow in Apple iTunes 4.7 allows remote attackers to execute arbitrary code via a long URL in (1) .m3u or (2) .pls playlist files.51Plan
- CVE-2009-0950Stack-based buffer overflow in Apple iTunes before 8.2 allows remote attackers to execute arbitrary code or cause a denial of service (appli46Plan
- CVE-2012-0677Heap-based buffer overflow in Apple iTunes before 10.6.3 allows remote attackers to execute arbitrary code or cause a denial of service (app42Plan
- CVE-2010-1769WebKit in Apple iTunes before 9.2 on Windows, and Apple iOS before 4 on the iPhone and iPod touch, accesses out-of-bounds memory during the 42Plan
- CVE-2019-6235A memory corruption issue was addressed with improved validation.41Plan
- CVE-2010-1763Unspecified vulnerability in WebKit in Apple iTunes before 9.2 on Windows has unknown impact and attack vectors, a different vulnerability t41Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:icu | 52.1-9 · Debian:12 | Package registry (OSV) |
| opensuse:libreoffice | 5.2.3.3-2.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| suse:apache-commons-logging | 1.1.3-7.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:cmis-client | 0.5.0-5.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:flute | 1.3.0-4.2 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:graphite2 | 1.3.1-3.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:hyphen | 2.8.8-9.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:libabw | 0.1.1-5.3 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:libbase | 1.1.3-4.3 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:libcdr | 0.1.1-5.3 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:libe-book | 0.1.2-4.2 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:libetonyek | 0.1.3-3.5 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:libfonts | 1.1.3-4.9 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:libformula | 1.1.3-4.3 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Exploit-DB entry ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | local | 2015-06-10 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+15 d
- TodaySep 30, 2026+4146 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- P · data can be read
- Integrity
- P · data or configuration can be modified
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- P
- Integrity impact
- P
- Availability impact
- P
Weakness class (CWE)
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory BufferCVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Overflow BuffersCAPEC-100likelihood: High · Very High
- Buffer ManipulationCAPEC-123likelihood: High · Very High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
- Filter Failure through Buffer OverflowCAPEC-24likelihood: High · High
- MIME ConversionCAPEC-42likelihood: High · High
- Overflow Binary Resource FileCAPEC-44likelihood: High · Very High
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- bugs.icu-project.org/trac/changeset/37162
- lists.apple.com/archives/security-announce/2015/Sep/msg00001.html
- lists.apple.com/archives/security-announce/2015/Sep/msg00003.html
- lists.apple.com/archives/security-announce/2015/Sep/msg00005.html
- lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
- openwall.com/lists/oss-security/2015/05/05/6
- www.debian.org/security/2015/dsa-3323
- www.kb.cert.org/vuls/id/602540
- www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
- www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
- www.securityfocus.com/bid/74457
- security.gentoo.org/glsa/201507-04
- support.apple.com/HT205212
- support.apple.com/HT205213
- support.apple.com/HT205221
- support.apple.com/HT205267
- www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.