How severe is CVE-2025-55763?

CVE-2025-55763 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-2025-55763 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-55763?

CVE-2025-55763 affects Civetweb Project Civetweb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-55763?

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-2025-55763 have an EU (EUVD) identifier?

Yes. CVE-2025-55763 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26228.

When was CVE-2025-55763 published?

CVE-2025-55763 was published on 2025-08-29 and last updated on 2026-06-17.

CVE-2025-55763

CVE-2025-55763 is a high-severity vulnerability in Civetweb Project Civetweb 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-121.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-26228
Weakness: CWE-121
Affected product: Civetweb Project Civetweb
Published: 2025-08-29
Last modified: 2026-06-17

Description

Buffer Overflow in the URI parser of CivetWeb 1.14 through 1.16 (latest) allows a remote attacker to achieve remote code execution via a crafted HTTP request. This vulnerability is triggered during request processing and may allow an attacker to corrupt heap memory, potentially leading to denial of service or arbitrary code execution.

Frequently asked questions

What is CVE-2025-55763?: Buffer Overflow in the URI parser of CivetWeb 1.14 through 1.16 (latest) allows a remote attacker to achieve remote code execution via a crafted HTTP request. This vulnerability is triggered during request processing and may allow an attacker to corrupt heap memory, potentially leading to denial of service or arbitrary code execution.
How severe is CVE-2025-55763?: CVE-2025-55763 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-2025-55763 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-55763?: CVE-2025-55763 affects Civetweb Project Civetweb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-55763?: 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-2025-55763 have an EU (EUVD) identifier?: Yes. CVE-2025-55763 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26228.
When was CVE-2025-55763 published?: CVE-2025-55763 was published on 2025-08-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:civetweb_project:civetweb:*:*:*:*:*:*:*:*

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