How severe is CVE-2023-51773?

CVE-2023-51773 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2023-51773 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-51773?

CVE-2023-51773 affects Bacnetstack Bacnet Stack. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-51773?

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

When was CVE-2023-51773 published?

CVE-2023-51773 was published on 2024-02-29 and last updated on 2026-06-17.

CVE-2023-51773

CVE-2023-51773 is a critical-severity vulnerability in Bacnetstack Bacnet Stack with a CVSS 3.x base score of 9.1. 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-126.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-126
Affected product: Bacnetstack Bacnet Stack
Published: 2024-02-29
Last modified: 2026-06-17

Description

BACnet Stack before 1.3.2 has a decode function APDU buffer over-read in bacapp_decode_application_data in bacapp.c.

Frequently asked questions

What is CVE-2023-51773?: BACnet Stack before 1.3.2 has a decode function APDU buffer over-read in bacapp_decode_application_data in bacapp.c.
How severe is CVE-2023-51773?: CVE-2023-51773 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2023-51773 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-51773?: CVE-2023-51773 affects Bacnetstack Bacnet Stack. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-51773?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-51773 published?: CVE-2023-51773 was published on 2024-02-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bacnetstack:bacnet_stack:*:*:*:*:*:*:*:*

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