How severe is CVE-2023-51771?

CVE-2023-51771 has a CVSS 3.x base score of 9.8, 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 high, and availability high.

Is CVE-2023-51771 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-51771?

CVE-2023-51771 affects Starnight Micro Http Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-51771?

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-2023-51771 published?

CVE-2023-51771 was published on 2023-12-25 and last updated on 2026-06-17.

CVE-2023-51771

CVE-2023-51771 is a critical-severity vulnerability in Starnight Micro Http Server with a CVSS 3.x base score of 9.8. 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-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Starnight Micro Http Server
Published: 2023-12-25
Last modified: 2026-06-17

Description

In MicroHttpServer (aka Micro HTTP Server) through a8ab029, _ParseHeader in lib/server.c allows a one-byte recv buffer overflow via a long URI.

Frequently asked questions

What is CVE-2023-51771?: In MicroHttpServer (aka Micro HTTP Server) through a8ab029, _ParseHeader in lib/server.c allows a one-byte recv buffer overflow via a long URI.
How severe is CVE-2023-51771?: CVE-2023-51771 has a CVSS 3.x base score of 9.8, 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 high, and availability high.
Is CVE-2023-51771 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-51771?: CVE-2023-51771 affects Starnight Micro Http Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-51771?: 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-2023-51771 published?: CVE-2023-51771 was published on 2023-12-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:starnight:micro_http_server:-:*:*:*:*:*:*:*

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