How severe is CVE-2023-40295?

CVE-2023-40295 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-40295 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40295?

CVE-2023-40295 affects 0branch Boron. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-40295?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-40295 published?

CVE-2023-40295 was published on 2023-08-14 and last updated on 2026-06-17.

CVE-2023-40295

CVE-2023-40295 is a high-severity vulnerability in 0branch Boron with a CVSS 3.x base score of 8.8. 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-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: 0branch Boron
Published: 2023-08-14
Last modified: 2026-06-17

Description

libboron in Boron 2.0.8 has a heap-based buffer overflow in ur_strInitUtf8 at string.c.

Frequently asked questions

What is CVE-2023-40295?: libboron in Boron 2.0.8 has a heap-based buffer overflow in ur_strInitUtf8 at string.c.
How severe is CVE-2023-40295?: CVE-2023-40295 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-40295 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40295?: CVE-2023-40295 affects 0branch Boron. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-40295?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-40295 published?: CVE-2023-40295 was published on 2023-08-14 and last updated on 2026-06-17.

References

https://github.com/0branch/boron/issues/3

Affected products (1)

cpe:2.3:a:0branch:boron:2.0.8:*:*:*:*:*:*:*

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CVE-2023-40294 — Medium (CVSS 6.5): libboron in Boron 2.0.8 has a heap-based buffer overflow in ur_parseBlockI at i_parse_blk.c.

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