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NVD / CVE Program· CNA jpcert

CVE-2025-62689: NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier.

Noroxi assessment

Priority: Monitor (action score 34/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.48% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: libmicrohttpd (openSUSE:Leap 15.6) 0.9.77-150600.3.3.1; libmicrohttpd (openSUSE:Leap 16.0) 1.0.1-160000.3.1; libmicrohttpd (SUSE:Linux Enterprise Module for Basesystem 15 SP6) 0.9.77-150600.3.3.1.

Low priority for now. Upgrade to libmicrohttpd (openSUSE:Leap 15.6) 0.9.77-150600.3.3.1; libmicrohttpd (openSUSE:Leap 16.0) 1.0.1-160000.3.1; libmicrohttpd (SUSE:Linux Enterprise Module for Basesystem 15 SP6) 0.9.77-150600.3.3.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.7 · v4.0—No exploit Fix available
Published
Nov 10, 2025
Updated
Oct 8, 2026
EPSS
0.4% · 41th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · jpcert
7.5
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
gnulibmicrohttpd

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • gnu libmicrohttpdbefore 1.0.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (jpcert). Independent of NVD's CPE analysis and usually ahead of it.

  • GNU Project GNU libbmicrohttpd

    • v1.0.2 and earlier (The vulnerability remains in the source code up until commit ff13abc on the master branch of the libmicrohttpd Git repository, after the v1.0.2 tag.)affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12libmicrohttpdfrom 0—
openSUSE:Leap 15.6libmicrohttpdbefore 0.9.77-150600.3.3.10.9.77-150600.3.3.1
openSUSE:Leap 16.0libmicrohttpdbefore 1.0.1-160000.3.11.0.1-160000.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6libmicrohttpdbefore 0.9.77-150600.3.3.10.9.77-150600.3.3.1
SUSE:Linux Enterprise Server 16.0libmicrohttpdbefore 1.0.1-160000.3.11.0.1-160000.3.1
SUSE:Linux Micro 6.0libmicrohttpdbefore 0.9.77-2.10.9.77-2.1
SUSE:Linux Micro 6.1libmicrohttpdbefore 0.9.77-slfo.1.1_2.10.9.77-slfo.1.1_2.1

Same product

gnu: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-3466A flaw was found in libmicrohttpd.
    42Plan
  • CVE-2025-59777NULL pointer dereference vulnerability exists in GNU libmicrohttpd v1.0.2 and earlier.
    34Monitor
  • CVE-2013-7038The MHD_http_unescape function in libmicrohttpd before 0.9.32 might allow remote attackers to obtain sensitive information or cause a denial
    26Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2013-7039Dec 13, 2013 · Stack-based buffer overflow in the MHD_digest_auth_check function in libmicrohttpd before 0.9.32, when MHD_OPTION_CONNECTION_MEMORY_LIMIT is
    21Monitor
  • ← EarlierCVE-2023-27371Feb 28, 2023 · GNU libmicrohttpd before 0.9.76 allows remote DoS (Denial of Service) due to improper parsing of a multipart/form-data boundary in the postp
    23Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
opensuse:libmicrohttpd0.9.77-150600.3.3.1 · openSUSE:Leap 15.6Package registry (OSV)
suse:libmicrohttpd0.9.77-150600.3.3.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package registry (OSV)
suse:libmicrohttpd0.9.77-2.1 · SUSE:Linux Micro 6.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records