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CVE Record

CVE-2020-28041: The SIP ALG implementation on NETGEAR Nighthawk R7000 1.0.9.64_10.2.64 devices allows remote attackers to c...

The SIP ALG implementation on NETGEAR Nighthawk R7000 1.0.9.64_10.2.64 devices allows remote attackers to communicate with arbitrary TCP and UDP services on a victim's intranet machine, if the victim visits an attacker-controlled web site with a modern browser, aka NAT Slipstreaming. This occurs because the ALG takes action based on an IP packet with an initial REGISTER substring in the TCP data, and the correct intranet IP address in the subsequent Via header, without properly considering that connection progress and fragmentation affect the meaning of the packet data.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw affects the SIP ALG behavior on a specific NETGEAR Nighthawk R7000 firmware. A user visiting an attacker-controlled website could let the attacker reach services on an internal machine that normally sits behind NAT. The supplied sources do not provide CVSS, a vendor fix, or evidence of active exploitation.

Executive priority

Treat as a targeted network-edge exposure issue, not a confirmed emergency. Prioritize inventory and vendor guidance because the flaw can bridge web browsing into internal service access, but current evidence does not show active exploitation or a confirmed patch in the supplied bundle.

Technical view

CVE-2020-28041 describes NAT Slipstreaming against NETGEAR Nighthawk R7000 1.0.9.64_10.2.64. The SIP ALG reacts to crafted TCP data beginning with REGISTER and a later Via header containing an intranet IP, without properly accounting for connection progress and fragmentation. This can expose arbitrary TCP or UDP intranet services through browser-mediated traffic.

Likely exposure

Exposure is likely limited to environments using NETGEAR Nighthawk R7000 devices on firmware 1.0.9.64_10.2.64 with SIP ALG behavior enabled. Risk depends on users browsing from behind the device and the sensitivity of internal services reachable from the LAN.

Exploitation context

The attack requires a victim behind the affected router to visit an attacker-controlled website with a modern browser. The bundle marks KEV as false and provides no cited evidence of in-the-wild exploitation.

Researcher notes

The source bundle names one affected firmware and provides the core parser/fragmentation weakness, but omits CVSS, CWE, CPEs, patch status, and detailed vendor remediation. Avoid broad product claims beyond NETGEAR Nighthawk R7000 1.0.9.64_10.2.64.

Mitigation direction

  • Inventory NETGEAR Nighthawk R7000 devices and record firmware versions.
  • Check NETGEAR guidance for fixed firmware or supported configuration changes.
  • Restrict sensitive internal services to authenticated and segmented networks.
  • Limit browsing from sensitive network segments where practical.
  • Monitor vendor and browser guidance related to NAT Slipstreaming.

Validation and detection

  • Confirm whether any R7000 device runs firmware 1.0.9.64_10.2.64.
  • Review router configuration for SIP ALG exposure using vendor-supported methods.
  • Identify internal TCP and UDP services reachable from affected LANs.
  • Check logs for unusual inbound connections following user web-browsing activity.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2020-28041 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.