CVE-2020-19722Public exploitNetwork attack vector

Process crash via atom terminator buffer underflow

Published Jul 13, 2021 · Updated Aug 4, 2024

Heap-buffer underflow in AP4_NullTerminatedStringAtom in Axiomatic Systems Bento4 1.5.1-628 allows attackers to crash mp42aac via crafted media. The constructor allocates a one-byte buffer for a zero-length atom payload, then writes the terminator one byte before that allocation. Processing the supplied file with mp42aac triggers the out-of-bounds write and an AddressSanitizer abort, so opening attacker-controlled media interrupts the process.

CVSS severity6.5
Medium
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer underflow in AP4_NullTerminatedStringAtom in Axiomatic Systems Bento4 1.5.1-628 allows attackers to crash mp42aac via crafted media. The constructor allocates a one-byte buffer for a zero-length atom payload, then writes the terminator one byte before that allocation. Processing the supplied file with mp42aac triggers the out-of-bounds write and an AddressSanitizer abort, so opening attacker-controlled media interrupts the process.

The record

CVE
CVE-2020-19722
Published
Jul 13, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, CWE-120, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1204.002Malicious 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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