CVE-2025-59777: libmicrohttpd Null Dereference — Fix

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
gnu	libmicrohttpd	< 2025-09-16

References

Advisories & Patches

https://git.gnunet.org/libmicrohttpd.git/commit/?id=ff13abc1c1d7d2b30d69d5c0bd4a237e1801c50b

Other References

https://jvn.jp/en/jp/JVN76719218/ https://www.gnu.org/software/libmicrohttpd/

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-59777? +

CVE-2025-59777 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-59777? +

CVE-2025-59777 affects products from gnu, specifically: libmicrohttpd. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59777? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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