How severe is CVE-2017-17484?

CVE-2017-17484 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-17484 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-17484?

CVE-2017-17484 affects Icu-project International Components For Unicode. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-17484?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2017-17484 published?

CVE-2017-17484 was published on 2017-12-10 and last updated on 2026-06-17.

CVE-2017-17484

CVE-2017-17484 is a critical-severity vulnerability in Icu-project International Components For Unicode with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Icu-project International Components For Unicode
Published: 2017-12-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2017-17484?: CVE-2017-17484 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-17484 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-17484?: CVE-2017-17484 affects Icu-project International Components For Unicode. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-17484?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-17484 published?: CVE-2017-17484 was published on 2017-12-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:icu-project:international_components_for_unicode:*:*:*:*:*:c\/c\+\+:*:*

More vulnerabilities in Icu-project International Components For Unicode

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CVE-2014-9654 — Critical (CVSS 9.8): The Regular Expressions package in International Components for Unicode (ICU) for C/C++ before 2014-12-03, as used in…
CVE-2014-9911 — Critical (CVSS 9.8): Stack-based buffer overflow in the ures_getByKeyWithFallback function in common/uresbund.cpp in International…
CVE-2016-7415 — Critical (CVSS 9.8): Stack-based buffer overflow in the Locale class in common/locid.cpp in International Components for Unicode (ICU)…

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