CVE-2021-21859
An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality...
An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The stri_box_read function is used when processing atoms using the 'stri' FOURCC code. An attacker can convince a user to open a video to trigger this vulnerability.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The stri_box_read function is used when processing atoms using the 'stri' FOURCC code. An attacker can convince a user to open a video to trigger this vulnerability.
- Record
CVE-2021-21859- CVSS 3.0
- 8.8 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-680
- Updated
- 2026-11-02
EUVDEUVD-2021-9030
An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The stri_box_read function is used when processing atoms using the 'stri' FOURCC code. An attacker can convince a user to open a video to trigger this vulnerability.
- Record
EUVD-2021-9030- CVSS 3.0
- 8.8 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vh5q-v342-6m3c
An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality...
An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The stri_box_read function is used when processing atoms using the 'stri' FOURCC code. An attacker can convince a user to open a video to trigger this vulnerability.
- Record
GHSA-vh5q-v342-6m3c- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-190
- Updated
- 2026-11-02
NVD
An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The stri_box_read function is used when processing atoms using the 'stri' FOURCC code. An attacker can convince a user to open a video to trigger this vulnerability.
- Record
CVE-2021-21859- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 3.0
- 8.8 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-680, CWE-190
- Updated
- 2026-11-02
OSV
An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The stri_box_read function is used when processing atoms using the 'stri' FOURCC code. An attacker can convince a user to open a video to trigger this vulnerability.
- Record
CVE-2021-21859- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2021-21859
An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The stri_box_read function is used when processing atoms using the 'stri' FOURCC code. An attacker can convince a user to open a video to trigger this vulnerability.
- Record
DEBIAN-CVE-2021-21859- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-21859
An exploitable integer truncation vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The stri_box_read function is used when processing atoms using the 'stri' FOURCC code. An attacker can convince a user to open a video to trigger this vulnerability.
- Record
UBUNTU-CVE-2021-21859- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 3.0
- 8.8 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVMGASA-2021-0431 No score
Updated gpac packages fix security vulnerability
A specially crafted MPEG-4 input when decoding the atom for the "co64" FOURCC can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21834)
A specially crafted MPEG-4 input using the "ctts" FOURCC code can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21836)
A specially crafted MPEG-4 input can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21837, CVE-2021-21838, CVE-2021-21839)
A specially crafted MPEG-4 input used to process an atom using the "saio" FOURCC code cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21840)
A specially crafted MPEG-4 input when reading an atom using the 'sbgp' FOURCC code can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21841)
A specially crafted MPEG-4 input can cause an integer overflow when processing an atom using the 'ssix' FOURCC code, due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21842)
A specially crafted MPEG-4 input can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. After validating the number of ranges, at [41] the library will multiply the count by the size of the GF_SubsegmentRangeInfo structure. On a 32-bit platform, this multiplication can result in an integer overflow causing the space of the array being allocated to be less than expected. (CVE-2021-21843)
A specially crafted MPEG-4 input when encountering an atom using the "stco" FOURCC code, can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21844)
A specially crafted MPEG-4 input in "stsc" decoder can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21845)
A specially crafted MPEG-4 input in "stsz&" decoder can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21846)
A specially crafted MPEG-4 input in "stts" decoder can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21847)
The library will actually reuse the parser for atoms with the "stsz" FOURCC code when parsing atoms that use the "stz2" FOURCC code and can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21848)
A specially crafted MPEG-4 input can cause an integer overflow when the library encounters an atom using the "tfra" FOURCC code due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21849)
A specially crafted MPEG-4 input can cause an integer overflow when the library encounters an atom using the "trun" FOURCC code due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21850)
A specially crafted MPEG-4 input can cause an integer overflow due to unchecked addition arithmetic resulting in a heap-based buffer overflow that causes memory corruption. (CVE-2021-21853, CVE-2021-21854, CVE-2021-21855, CVE-2021-21857, CVE-2021-21858)
The stri_box_read function is used when processing atoms using the 'stri' FOURCC code. (CVE-2021-21859)
A specially crafted MPEG-4 input can cause an improper memory allocation resulting in a heap-based buffer overflow that causes memory corruption. The FOURCC code, 'trik', is parsed by the function…
- Record
MGASA-2021-0431- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
gpacDebian:11 |
before 1.0.1+dfsg1-4+deb11u1, plus listed versions 1.0.1+dfsg1-4 |
1.0.1+dfsg1-4+deb11u1 |
gpacDebian:11 From an advisory covering 24 CVEs |
before 1.0.1+dfsg1-4+deb11u1, plus listed versions 1.0.1+dfsg1-4 |
1.0.1+dfsg1-4+deb11u1 |
gpacMageia:8 From an advisory covering 24 CVEs |
before 1.0.1-1.1.mga8.tainted | 1.0.1-1.1.mga8.tainted |
gpacUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 0.5.0+svn4288~dfsg1-1ubuntu10.5.0+svn4288~dfsg1-40.5.0+svn4288~dfsg1-4ubuntu10.5.0+svn4288~dfsg1-4ubuntu1+esm10.5.0+svn4288~dfsg1-4ubuntu1+esm2 |
None known |
gpacUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 0.5.2-426-gc5ad4e4+dfsg5-1build10.5.2-426-gc5ad4e4+dfsg5-1ubuntu0.10.5.2-426-gc5ad4e4+dfsg5-1ubuntu0.1+esm2 |
None known |
gpacUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 0.5.2-426-gc5ad4e4+dfsg5-30.5.2-426-gc5ad4e4+dfsg5-3ubuntu0.10.5.2-426-gc5ad4e4+dfsg5-3ubuntu0.1+esm1 |
None known |
gpacUbuntu:Pro:20.04:LTS |
All versions, plus listed versions 0.5.2-426-gc5ad4e4+dfsg5-4ubuntu10.5.2-426-gc5ad4e4+dfsg5-50.5.2-426-gc5ad4e4+dfsg5-5ubuntu0.1~esm2 |
None known |
gpacUbuntu:Pro:22.04:LTS |
All versions, plus listed versions 1.0.1+dfsg1-41.0.1+dfsg1-52.0.0+dfsg1-22.0.0+dfsg1-2ubuntu0.1~esm2 |
None known |
gpacUbuntu:Pro:24.04:LTS |
All versions, plus listed versions 2.2.1+dfsg1-32.2.1+dfsg1-3.12.2.1+dfsg1-3.1build12.2.1+dfsg1-3.1build22.2.1+dfsg1-3.1ubuntu0.1~esm2 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-21859 is a high vulnerability (CVSS 8.8) in Gpac, published August 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.59%, the 75th percentile. Fixed in gpac 1.0.1+dfsg1-4+deb11u1.
References
talosintelligence.com/vulnerability_reports/TALOS-2021-1298
debian.org/security/2021/dsa-4966
nvd.nist.gov/vuln/detail/CVE-2021-21859
github.com/advisories/GHSA-vh5q-v342-6m3c
security-tracker.debian.org/tracker/CVE-2021-21859
advisories.mageia.org/MGASA-2021-0431.html
bugs.mageia.org/show_bug.cgi?id=29432
ubuntu.com/security/CVE-2021-21859
cve.org/CVERecord?id=CVE-2021-21859
Left out here: the rest of 1 source description. The JSON record has them.