How severe is CVE-2025-59777?

CVE-2025-59777 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-2025-59777 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59777?

CVE-2025-59777 affects Gnu Libmicrohttpd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59777?

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-2025-59777 have an EU (EUVD) identifier?

Yes. CVE-2025-59777 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-41747.

When was CVE-2025-59777 published?

CVE-2025-59777 was published on 2025-11-10 and last updated on 2026-06-17.

CVE-2025-59777

CVE-2025-59777 is a high-severity vulnerability in Gnu Libmicrohttpd 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-41747
Weakness: CWE-476
Affected product: Gnu Libmicrohttpd
Published: 2025-11-10
Last modified: 2026-06-17

Description

NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier. The vulnerability was fixed in commit ff13abc on the master branch of the libmicrohttpd Git repository, after the v1.0.2 tag. A specially crafted packet sent by an attacker could cause a denial-of-service (DoS) condition.

Frequently asked questions

What is CVE-2025-59777?: NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier. The vulnerability was fixed in commit ff13abc on the master branch of the libmicrohttpd Git repository, after the v1.0.2 tag. A specially crafted packet sent by an attacker could cause a denial-of-service (DoS) condition.
How severe is CVE-2025-59777?: CVE-2025-59777 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-2025-59777 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59777?: CVE-2025-59777 affects Gnu Libmicrohttpd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59777?: 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-2025-59777 have an EU (EUVD) identifier?: Yes. CVE-2025-59777 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-41747.
When was CVE-2025-59777 published?: CVE-2025-59777 was published on 2025-11-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gnu:libmicrohttpd:*:*:*:*:*:*:*:*

More vulnerabilities in Gnu Libmicrohttpd

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CVE-2023-27371 — Medium (CVSS 5.9): GNU libmicrohttpd before 0.9.76 allows remote DoS (Denial of Service) due to improper parsing of a multipart/form-data…
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