CVE-2021-43814Public exploit

Code execution via zero-count DWARF abbreviation underflow

Published Dec 13, 2021 · Updated Aug 4, 2024

Out-of-bounds write in Rizin 0.3.1 and earlier allows local users to crash the process or execute code through a crafted AMD64 ELF file. In parse_die(), a zero DWARF abbreviation count underflows abbrev->count - 1, so the loop writes a 40-byte attribute past a zero-length allocation. The target must open and analyze an AMD64 ELF file containing crafted DWARF debug information; the demonstrated proof of concept aborts under AddressSanitizer.

CVSS severity7.7
High
EPSS probability0.85%
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 write in Rizin 0.3.1 and earlier allows local users to crash the process or execute code through a crafted AMD64 ELF file. In parse_die(), a zero DWARF abbreviation count underflows abbrev->count - 1, so the loop writes a 40-byte attribute past a zero-length allocation. The target must open and analyze an AMD64 ELF file containing crafted DWARF debug information; the demonstrated proof of concept aborts under AddressSanitizer.

The record

CVE
CVE-2021-43814
Published
Dec 13, 2021
Updated
Aug 4, 2024
Vendor
Rizin Organization
Product
Rizin
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 13, 2021CVE 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=<= 0.3.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Rizin Organization · Rizinversion=<= 0.3.1

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.7GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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