CVE-2025-15536

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.25% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 16.5% of scored records. A rank, not a probability.

NVD base score

1.9 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-01-18 09:02Z9 MO AGO

Last updated

2026-02-23 08:37Z8 MO AGO

Reserved

2026-01-17

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 4.8)

CNA CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-122Heap-based Buffer OverflowVariant
• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

e6c41674b70c3f91c3b28c10c360d76fd21cbcba684b2abe1474d4a9d4b5e58c

• vuldb.comVDB-341708 | BYVoid OpenCC MaxMatchSegmentation.cpp MaxMatchSegmentation heap-based overflowhttps://vuldb.com/?id.341708vdb-entrytechnical-description
• vuldb.comVDB-341708 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/?ctiid.341708signaturepermissions-required
• vuldb.comSubmit #733347 | BYVoid OpenCC ver.1.1.9 and master-branch Heap-based Buffer Overflowhttps://vuldb.com/?submit.733347third-party-advisory
• github.comhttps://github.com/BYVoid/OpenCC/issues/997issue-tracking
• github.comhttps://github.com/BYVoid/OpenCC/pull/1005issue-tracking
• github.comhttps://github.com/oneafter/1222/blob/main/reproexploit
• github.comhttps://github.com/BYVoid/OpenCC/commit/345c9a50ab07018f1b4439776bad78a0d40778ecpatch
• github.comhttps://github.com/BYVoid/OpenCC/product