How severe is CVE-2023-29420?

CVE-2023-29420 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-29420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-29420?

CVE-2023-29420 affects Bzip3 Project Bzip3. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-29420?

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

When was CVE-2023-29420 published?

CVE-2023-29420 was published on 2023-04-06 and last updated on 2026-06-17.

CVE-2023-29420

CVE-2023-29420 is a medium-severity vulnerability in Bzip3 Project Bzip3 with a CVSS 3.x base score of 6.5. 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-119.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Bzip3 Project Bzip3
Published: 2023-04-06
Last modified: 2026-06-17

Description

An issue was discovered in libbzip3.a in bzip3 before 1.2.3. There is a crash caused by an invalid memmove in bz3_decode_block.

Frequently asked questions

What is CVE-2023-29420?: An issue was discovered in libbzip3.a in bzip3 before 1.2.3. There is a crash caused by an invalid memmove in bz3_decode_block.
How severe is CVE-2023-29420?: CVE-2023-29420 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-29420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-29420?: CVE-2023-29420 affects Bzip3 Project Bzip3. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-29420?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-29420 published?: CVE-2023-29420 was published on 2023-04-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bzip3_project:bzip3:*:*:*:*:*:*:*:*

More vulnerabilities in Bzip3 Project Bzip3

CVE-2023-29421 — High (CVSS 8.8): An issue was discovered in libbzip3.a in bzip3 before 1.2.3. There is an out-of-bounds write in bz3_decode_block.
CVE-2023-29419 — Medium (CVSS 6.5): An issue was discovered in libbzip3.a in bzip3 before 1.2.3. There is a bz3_decode_block out-of-bounds read.
CVE-2023-29418 — Medium (CVSS 6.5): An issue was discovered in libbzip3.a in bzip3 before 1.2.3. There is an xwrite out-of-bounds read.
CVE-2023-29417 — Medium (CVSS 6.5): An issue was discovered in libbzip3.a in bzip3 1.2.2. There is a bz3_decompress out-of-bounds read in certain…
CVE-2023-29416 — Medium (CVSS 6.5): An issue was discovered in libbzip3.a in bzip3 before 1.3.0. A bz3_decode_block out-of-bounds write can occur with a…
CVE-2023-29415 — Medium (CVSS 6.5): An issue was discovered in libbzip3.a in bzip3 before 1.3.0. A denial of service (process hang) can occur with a…

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