How severe is CVE-2021-27347?

CVE-2021-27347 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-2021-27347 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27347?

CVE-2021-27347 primarily affects Long Range Zip Project Long Range Zip. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27347?

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

When was CVE-2021-27347 published?

CVE-2021-27347 was published on 2021-06-10 and last updated on 2026-06-17.

CVE-2021-27347

CVE-2021-27347 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-416.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Affected product: Long Range Zip Project Long Range Zip
Published: 2021-06-10
Last modified: 2026-06-17

Description

Use after free in lzma_decompress_buf function in stream.c in Irzip 0.631 allows attackers to cause Denial of Service (DoS) via a crafted compressed file.

Frequently asked questions

What is CVE-2021-27347?: Use after free in lzma_decompress_buf function in stream.c in Irzip 0.631 allows attackers to cause Denial of Service (DoS) via a crafted compressed file.
How severe is CVE-2021-27347?: CVE-2021-27347 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-2021-27347 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27347?: CVE-2021-27347 primarily affects Long Range Zip Project Long Range Zip. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27347?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27347 published?: CVE-2021-27347 was published on 2021-06-10 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:long_range_zip_project:long_range_zip:0.631:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

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-2021-33451 — Medium (CVSS 5.5): An issue was discovered in lrzip version 0.641. There are memory leaks in fill_buffer() in stream.c.

All CVEs affecting Long Range Zip Project Long Range Zip →

Other CWE-416 (Use After Free) vulnerabilities

CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

Browse all CWE-416 (Use After Free) vulnerabilities →