How severe is CVE-2023-40294?

CVE-2023-40294 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-2023-40294 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40294?

CVE-2023-40294 affects 0branch Boron. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-40294?

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

When was CVE-2023-40294 published?

CVE-2023-40294 was published on 2023-08-14 and last updated on 2026-06-17.

CVE-2023-40294

CVE-2023-40294 is a medium-severity vulnerability in 0branch Boron 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-787.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (46th 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_parseBlockI at i_parse_blk.c.

Frequently asked questions

What is CVE-2023-40294?: libboron in Boron 2.0.8 has a heap-based buffer overflow in ur_parseBlockI at i_parse_blk.c.
How severe is CVE-2023-40294?: CVE-2023-40294 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-2023-40294 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40294?: CVE-2023-40294 affects 0branch Boron. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-40294?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-40294 published?: CVE-2023-40294 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:*:*:*:*:*:*:*

More vulnerabilities in 0branch Boron

CVE-2023-40295 — High (CVSS 8.8): libboron in Boron 2.0.8 has a heap-based buffer overflow in ur_strInitUtf8 at string.c.

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