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Improper Input ValidationWeakness · CWE-20

CVE-2025-0816

MEDIUM · 6.5 CVSS v3.1 Published 2025-02-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
70/100
Remediation priority · Elevated
No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
CWE-20: Improper Input Validation vulnerability exists that could cause Denial-of-Service of the product when malicious IPV6 packets are sent to the device.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

This is an improper input validation vulnerability (CWE-20) in IPv6 packet handling that allows remote attackers to cause denial-of-service by sending specially crafted malicious IPv6 packets to the target device. The vulnerability stems from insufficient validation of IPv6 packet data before processing.

MitigationImplement proper input validation and bounds checking on all IPv6 packet fields at the parsing stage; consider deploying network filtering or firewall rules to drop malformed IPv6 packets at the perimeter.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify IPv6-enabled network interfaces
    Run 'ip -6 addr show' on Linux, 'netsh interface ipv6 show addresses' on Windows, or check network adapter settings. List all interfaces with IPv6 addresses assigned.
    Affected if Any network interface has an active IPv6 address and can receive IPv6 traffic, making the system a potential target.
  2. Determine IPv6 packet processing components
    Identify software that handles IPv6 traffic: check running services (systemctl list-units --type=service), network daemons (sshd, httpd, nginx), firewall services (iptables, nftables, pf), or embedded firmware on network devices.
    Affected if Any service, daemon, or firmware component that parses or processes incoming IPv6 packets is present on the system.
  3. Check version of IPv6-processing software
    Query the installed version of each identified IPv6-handling component. For Linux packages use 'dpkg -l <package>' or 'rpm -qi <package>'. For Windows check via 'wmic product get name,version' or the software's --version flag. For network devices use 'show version' or vendor-specific commands.
    Affected if The installed version of any IPv6-processing component falls within a known vulnerable range (compare against vendor security advisories for CVE-2025-0816).
  4. Review IPv6-related crash or DoS logs
    Examine system logs for IPv6-related crashes or service disruptions. Use 'journalctl -b | grep -i ipv6' on Linux, check Windows Event Viewer under System/Application logs, or review device logs via 'show logging' on network gear.
    Affected if Recent crashes, kernel panics, or service failures coincide with IPv6 packet reception, indicating potential exploitation.
  5. Verify network perimeter filtering
    Check firewall rules for IPv6 packet filtering. On Linux: 'ip6tables -L -n' or 'nft list ruleset'. On Windows: 'netsh advfirewall firewall show rule name=all'. On network devices: 'show access-lists' for IPv6 entries.
    Affected if No IPv6-specific filtering rules exist at the perimeter, allowing malformed IPv6 packets to reach internal systems.

A system is affected if it processes IPv6 traffic with a software version known to lack proper input validation on IPv6 packet fields and lacks network filtering to drop malformed IPv6 packets at the perimeter.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement proper input validation and bounds checking on all IPv6 packet fields at the parsing stage; consider deploying network filtering or firewall rules to drop malformed IPv6 packets at the perimeter.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-0816 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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