CVE-2021-33453
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in...
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in stream.c:1538.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- 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
NVD Score used
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in stream.c:1538.
- Record
CVE-2021-33453- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-416
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in stream.c:1538.
- Record
CVE-2021-33453- Updated
- 2026-11-02
EUVDEUVD-2021-20157 No score
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in stream.c:1538.
- Record
EUVD-2021-20157- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5xh9-fg67-82m2
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in...
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in stream.c:1538.
- Record
GHSA-5xh9-fg67-82m2- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-416
- Updated
- 2026-11-02
OSV
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in stream.c:1538.
- Record
CVE-2021-33453- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2021-33453
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in stream.c:1538.
- Record
DEBIAN-CVE-2021-33453- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-33453
An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in stream.c:1538.
- Record
UBUNTU-CVE-2021-33453- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
lrzipDebian:12 |
All versions, plus listed versions 0.651-20.651-30.660-1 |
None known |
lrzipDebian:13 |
All versions, plus listed versions 0.651-30.660-1 |
None known |
lrzipDebian:14 |
All versions, plus listed versions 0.651-30.660-1 |
None known |
lrzipUbuntu:Pro:14.04:LTS |
All versions, plus listed versions 0.608-20.616-10.616-1ubuntu0.1~esm0.616-1ubuntu0.1~esm10.616-1ubuntu0.1~esm2 |
None known |
lrzipUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 0.621-10.621-1ubuntu0.1~esm10.621-1ubuntu0.1~esm2 |
None known |
lrzipUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 0.631-10.631-1ubuntu0.1~esm10.631-1+deb9u1build0.18.04.10.631-1+deb9u3build0.18.04.1 |
None known |
lrzipUbuntu:20.04:LTS |
All versions, plus listed versions 0.631+git180528-10.631+git180528-1build10.631+git180528-1+deb10u1build0.20.04.1 |
None known |
lrzipUbuntu:22.04:LTS |
All versions, plus listed versions 0.641-10.651-20.651-2ubuntu0.22.04.1 |
None known |
lrzipUbuntu:24.04:LTS |
All versions, plus listed versions 0.651-2ubuntu1 |
None known |
lrzipUbuntu:25.10 |
All versions, plus listed versions 0.651-2ubuntu10.651-3 |
None known |
lrzipUbuntu:26.10 |
All versions, plus listed versions 0.660-1 |
None known |
lrzipUbuntu:26.04:LTS |
All versions, plus listed versions 0.651-30.651-3build10.660-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| 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-2021-33453 is a high vulnerability (CVSS 7.8) in Long Range Zip Project Range Zip, published July 26, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.36%, the 30th percentile. No source names a fixed version.