How severe is CVE-2023-52389?

CVE-2023-52389 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-2023-52389 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-52389?

CVE-2023-52389 primarily affects Pocoproject Poco. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-52389?

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.

Does CVE-2023-52389 have an EU (EUVD) identifier?

Yes. CVE-2023-52389 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-57045.

When was CVE-2023-52389 published?

CVE-2023-52389 was published on 2024-01-27 and last updated on 2026-06-17.

CVE-2023-52389

CVE-2023-52389 is a critical-severity vulnerability in Pocoproject Poco 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-190.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-57045
Weakness: CWE-190
Affected product: Pocoproject Poco
Published: 2024-01-27
Last modified: 2026-06-17

Description

UTF32Encoding.cpp in POCO has a Poco::UTF32Encoding integer overflow and resultant stack buffer overflow because Poco::UTF32Encoding::convert() and Poco::UTF32::queryConvert() may return a negative integer if a UTF-32 byte sequence evaluates to a value of 0x80000000 or higher. This is fixed in 1.11.8p2, 1.12.5p2, and 1.13.0.

Frequently asked questions

What is CVE-2023-52389?: UTF32Encoding.cpp in POCO has a Poco::UTF32Encoding integer overflow and resultant stack buffer overflow because Poco::UTF32Encoding::convert() and Poco::UTF32::queryConvert() may return a negative integer if a UTF-32 byte sequence evaluates to a value of 0x80000000 or higher. This is fixed in 1.11.8p2, 1.12.5p2, and 1.13.0.
How severe is CVE-2023-52389?: CVE-2023-52389 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-2023-52389 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-52389?: CVE-2023-52389 primarily affects Pocoproject Poco. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-52389?: 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.
Does CVE-2023-52389 have an EU (EUVD) identifier?: Yes. CVE-2023-52389 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-57045.
When was CVE-2023-52389 published?: CVE-2023-52389 was published on 2024-01-27 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:pocoproject:poco:*:*:*:*:*:*:*:*
cpe:2.3:a:pocoproject:poco:1.11.8:-:*:*:*:*:*:*
cpe:2.3:a:pocoproject:poco:1.11.8:p1:*:*:*:*:*:*
cpe:2.3:a:pocoproject:poco:1.12.5:-:*:*:*:*:*:*

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