CVE-2017-17484: The ucnv_UTF8FromUTF8 function in ucnv_u8.cpp in International Components for Unicode (ICU) for C/C++ through

Q: How do I fix CVE-2017-17484?

international components for unicode: upgrade to newer than 60.1. Exact commands for each OS are on this page.

Q: Is CVE-2017-17484 being exploited?

CVE-2017-17484 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-17484 affect?

CVE-2017-17484 affects international components for unicode. Severity is critical (CVSS 9.8). 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 (st

Q: How urgent is CVE-2017-17484?

Priority 67/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2017-17484 is a critical-severity flaw (CVSS 9.8) affecting international components for unicode. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.5% (top 9%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-12-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: icu-project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-12-10 20:29 UTCPublished CVE record published
2026-06-17 01:10 UTCUpdated Record last modified

icu-project international components for unicode UPGRADE

Affected: <= 60.1

Fixed in: newer than 60.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy international-components-for-unicode || rpm -q international-components-for-unicode || international-components-for-unicode --version

2. UPGRADE to newer than 60.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade international-components-for-unicode

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade international-components-for-unicode

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-17484?

international components for unicode: upgrade to newer than 60.1. Exact commands for each OS are on this page.

Is CVE-2017-17484 being exploited?

CVE-2017-17484 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-17484 affect?

CVE-2017-17484 affects international components for unicode. Severity is critical (CVSS 9.8). 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 (st

How urgent is CVE-2017-17484?

Priority 67/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

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References

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