CVE-2021-45297Public exploit

Application hang via signed bit-shift loop

Published Dec 21, 2021 · Updated Aug 4, 2024

Infinite-loop handling in GPAC 1.0.1 allows context-dependent attackers to hang MP4Box by processing a crafted media file. The gf_get_bit_size function shifts a signed integer while deriving a bit count, allowing the comparison's exit condition to remain unreachable for a large attacker-influenced value. Exploitation requires a user or workflow to invoke MP4Box with the -hint option on the crafted file, consuming CPU until the process is terminated.

CVSS severity5.5
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Infinite-loop handling in GPAC 1.0.1 allows context-dependent attackers to hang MP4Box by processing a crafted media file. The gf_get_bit_size function shifts a signed integer while deriving a bit count, allowing the comparison's exit condition to remain unreachable for a large attacker-influenced value. Exploitation requires a user or workflow to invoke MP4Box with the -hint option on the crafted file, consuming CPU until the process is terminated.

The record

CVE
CVE-2021-45297
Published
Dec 21, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-835, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 21, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.

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-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Endpoint Denial of Service: Application 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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