How severe is CVE-2021-33451?

CVE-2021-33451 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-33451 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33451?

CVE-2021-33451 affects Long Range Zip Project Long Range Zip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33451?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-33451 published?

CVE-2021-33451 was published on 2022-07-26 and last updated on 2026-06-17.

CVE-2021-33451

CVE-2021-33451 is a medium-severity vulnerability in Long Range Zip Project Long Range Zip with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-401.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-401
Affected product: Long Range Zip Project Long Range Zip
Published: 2022-07-26
Last modified: 2026-06-17

Description

An issue was discovered in lrzip version 0.641. There are memory leaks in fill_buffer() in stream.c.

Frequently asked questions

What is CVE-2021-33451?: An issue was discovered in lrzip version 0.641. There are memory leaks in fill_buffer() in stream.c.
How severe is CVE-2021-33451?: CVE-2021-33451 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-33451 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33451?: CVE-2021-33451 affects Long Range Zip Project Long Range Zip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33451?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-33451 published?: CVE-2021-33451 was published on 2022-07-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:long_range_zip_project:long_range_zip:0.641:*:*:*:*:*:*:*

More vulnerabilities in Long Range Zip Project Long Range Zip

CVE-2018-10685 — Critical (CVSS 9.8): In Long Range Zip (aka lrzip) 0.631, there is a use-after-free in the lzma_decompress_buf function of stream.c, which…
CVE-2021-33453 — High (CVSS 7.8): An issue was discovered in lrzip version 0.641. There is a use-after-free in ucompthread() in stream.c:1538.
CVE-2017-8844 — High (CVSS 7.8): The read_1g function in stream.c in liblrzip.so in lrzip 0.631 allows remote attackers to cause a denial of service…
CVE-2018-11496 — Medium (CVSS 6.5): In Long Range Zip (aka lrzip) 0.631, there is a use-after-free in read_stream in stream.c, because decompress_file in…
CVE-2023-39741 — Medium (CVSS 5.5): lrzip v0.651 was discovered to contain a heap overflow via the libzpaq::PostProcessor::write(int) function at…
CVE-2022-33067 — Medium (CVSS 5.5): Lrzip v0.651 was discovered to contain multiple invalid arithmetic shifts via the functions get_magic in lrzip.c and…

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