How severe is CVE-2023-43688?

CVE-2023-43688 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-43688 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2023-43688?

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.

Does CVE-2023-43688 have an EU (EUVD) identifier?

Yes. CVE-2023-43688 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-60586.

When was CVE-2023-43688 published?

CVE-2023-43688 was published on 2026-06-09 and last updated on 2026-06-17.

CVE-2023-43688

CVE-2023-43688 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. 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-122.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-60586
Weakness: CWE-122
Published: 2026-06-09
Last modified: 2026-06-17

Description

An issue was discovered in Malwarebytes 4.x and 5.x (and Nebula 2020-10-21 and later). There is a Heap buffer overflow in various buffer encryption utilities.

Frequently asked questions

What is CVE-2023-43688?: An issue was discovered in Malwarebytes 4.x and 5.x (and Nebula 2020-10-21 and later). There is a Heap buffer overflow in various buffer encryption utilities.
How severe is CVE-2023-43688?: CVE-2023-43688 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-43688 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2023-43688?: 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.
Does CVE-2023-43688 have an EU (EUVD) identifier?: Yes. CVE-2023-43688 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-60586.
When was CVE-2023-43688 published?: CVE-2023-43688 was published on 2026-06-09 and last updated on 2026-06-17.

References

https://www.malwarebytes.com/secure/cves/cve-2023-43688

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