CVE-2020-27793Public exploit

Process crash via Java command bounds error

Published Aug 19, 2022 · Updated Aug 4, 2024

Off-by-one overflow in radare2 before 4.4.0 allows local users to crash the process through a malformed Java command. The r_cmd_java_call loop tests JAVA_CMDS entries through END_CMDS, although the terminal entry is not a command, so java 0 advances past the valid command array and dereferences invalid data. Any local user able to run an interactive radare2 session can terminate that process; no data disclosure, data modification, or broader host impact is reported.

CVSS severity7.5
High
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Off-by-one overflow in radare2 before 4.4.0 allows local users to crash the process through a malformed Java command. The r_cmd_java_call loop tests JAVA_CMDS entries through END_CMDS, although the terminal entry is not a command, so java 0 advances past the valid command array and dereferences invalid data. Any local user able to run an interactive radare2 session can terminate that process; no data disclosure, data modification, or broader host impact is reported.

The record

CVE
CVE-2020-27793
Published
Aug 19, 2022
Updated
Aug 4, 2024
Vendor
radareorg
Product
radare2
Classifications
CWE-193, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=Fixed in v4.4.0.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

radareorg · radare2version=Fixed in v4.4.0.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-193Off-by-one Error
T1499.004Application or System Exploitation

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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