CVE-2025-20234 | ClamAV UDF File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

A vulnerability in Universal Disk Format (UDF) processing of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to a memory overread during UDF file scanning. An attacker could exploit this vulnerability by submitting a crafted file containing UDF content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the ClamAV scanning process, resulting in a DoS condition on the affected software. For a description of this vulnerability, see the .

Published: 2025-06-18 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-20234 is rated Low Risk (37.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.66%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2025-20234

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 2026-06-15 0.85% 0.66% -0.18%
2 2026-05-20 0.71% 0.85% +0.14%
3 2026-04-14 — 0.71% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-20234

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2025-20234

OS Trackers for CVE-2025-20234

vendor priority summary link
alpine — CVE-2025-20234: 1 source package rows (clamav); 9 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 9. https://security.alpinelinux.org/vuln/CVE-2025-20234
debian unimportant CVE-2025-20234 unimportant priority: Debian including 1 source packages (clamav), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-20234
suse medium CVE-2025-20234 severity moderate: SUSE including 42 source package names (clamav-1.4.3-1.1, clamav-1.4.3-150200.8.14.1, …), 187 product×package rows across 28 product lines (Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production, … (28 product lines)): Fixed 187. https://www.suse.com/security/cve/CVE-2025-20234/
ubuntu medium CVE-2025-20234 medium priority: Ubuntu including 1 source packages (clamav), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, trusty, upstream, xenial): released 6, not-affected 3. https://ubuntu.com/security/CVE-2025-20234

Affected software / configurations for CVE-2025-20234

Vendor Product Version Raw CPE
clamav clamav >= 1.2.0, < 1.4.3 cpe:2.3:a:clamav:clamav:*:*:*:*:*:*:*:*
cisco secure_endpoint < 1.26.1 cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:linux:*:*
cisco secure_endpoint < 1.26.1 cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:macos:*:*
cisco secure_endpoint < 7.5.21 cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:*
cisco secure_endpoint >= 8.0.1.21160, < 8.4.5 cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:*
cisco secure_endpoint_private_cloud < 4.2.2 cpe:2.3:a:cisco:secure_endpoint_private_cloud:*:*:*:*:*:*:*:*

References for CVE-2025-20234

cvelogic Threat Intelligence