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.

Published: 2024-01-27 Last update: 2025-05-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-52389 is rated Moderate Risk (50.5/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.13%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-52389

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-16 0.18% 0.13% -0.05%
2 2026-02-28 0.14% 0.18% +0.04%
3 2025-11-21 — 0.14% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-52389

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2023-52389

OS Trackers for CVE-2023-52389

vendor priority summary link
alpine — CVE-2023-52389: 1 source package rows (poco); 4 state rows across 4 repos (3.19-community, 3.20-community, 3.22-community, edge-community); fixed 0, open 4. https://security.alpinelinux.org/vuln/CVE-2023-52389
debian not yet assigned CVE-2023-52389 not yet assigned priority: Debian including 1 source packages (poco), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2023-52389
ubuntu medium CVE-2023-52389 medium priority: Ubuntu including 1 source packages (poco), 11 status rows across 11 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 8, ignored 3. https://ubuntu.com/security/CVE-2023-52389

Affected software / configurations for CVE-2023-52389

Vendor Product Version Raw CPE
pocoproject poco < 1.11.8 cpe:2.3:a:pocoproject:poco:*:*:*:*:*:*:*:*
pocoproject poco >= 1.12.0, < 1.12.5 cpe:2.3:a:pocoproject:poco:*:*:*:*:*:*:*:*
pocoproject poco 1.11.8 cpe:2.3:a:pocoproject:poco:1.11.8:-:*:*:*:*:*:*
pocoproject poco 1.11.8 cpe:2.3:a:pocoproject:poco:1.11.8:p1:*:*:*:*:*:*
pocoproject poco 1.12.5 cpe:2.3:a:pocoproject:poco:1.12.5:-:*:*:*:*:*:*

References for CVE-2023-52389

cvelogic Threat Intelligence