CVE-2023-5686Public exploit

Service interruption via Java disassembler out-of-bounds read

Published Oct 20, 2023 · Updated Feb 13, 2025

Out-of-bounds read in radare2 before 5.9.0 allows local users to interrupt analysis by supplying a truncated Java bytecode instruction. The java_print_opcode function accepts a buffer longer than one byte and then reads a two-byte branch operand without ensuring that the complete instruction is present. Triggering requires local analysis of crafted input; the resulting undefined behavior can interrupt the process, and upstream states that it is not exploitable.

CVSS severity5.1
Medium
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in radare2 before 5.9.0 allows local users to interrupt analysis by supplying a truncated Java bytecode instruction. The java_print_opcode function accepts a buffer longer than one byte and then reads a two-byte branch operand without ensuring that the complete instruction is present. Triggering requires local analysis of crafted input; the resulting undefined behavior can interrupt the process, and upstream states that it is not exploitable.

The record

CVE
CVE-2023-5686
Published
Oct 20, 2023
Updated
Feb 13, 2025
Vendor
radareorg
Product
radare2
Classifications
CWE-787, CWE-122, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <5.9.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

radareorg · radare2version=unspecified <5.9.0

Published CVSS scores

5.1huntr.devCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
T1204.002User Execution: Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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