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TI-2021-08779 Aliases CVE-2021-27239GHSA-hqww-3wrx-q5gv

Stack-based buffer overflow in NETGEAR Multiple Routers

Priority LOW 39CWE-121Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6400 and R6700 firmware version 1.0.4.98 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the upnpd service, which listens on UDP port 1900 by default. A crafted MX header field in an SSDP message can trigger an overflow of a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11851.

Why it matters now

EPSS 0.00772 55th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
NETGEARMultiple Routersfirmware version 1.0.4.98—No fix listedCNA
  • Multiple Routers VendorNETGEAR Affected firmware version 1.0.4.98 Fixed in — No fix listed CNA

CPE configurations NVD · 72

CPEVersionsRoleVendor
cpe:2.3:o:netgear:d6220_firmware:*:*:*:*:*:*:*:*before 1.0.0.68VulnerableNETGEAR
cpe:2.3:h:netgear:d6220:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:d6400_firmware:*:*:*:*:*:*:*:*before 1.0.0.102VulnerableNETGEAR
cpe:2.3:h:netgear:d6400:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:d7000_firmware:*:*:*:*:*:*:*:*before 1.0.0.66VulnerableNETGEAR
cpe:2.3:h:netgear:d7000:v2:*:*:*:*:*:*:*v2Running onNETGEAR
cpe:2.3:o:netgear:d8500_firmware:*:*:*:*:*:*:*:*before 1.0.3.60VulnerableNETGEAR
cpe:2.3:h:netgear:d8500:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:dc112a_firmware:*:*:*:*:*:*:*:*before 1.0.0.54VulnerableNETGEAR
cpe:2.3:h:netgear:dc112a:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
  • cpe:2.3:o:netgear:d6220_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.68 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:d6220:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:d6400_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.102 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:d6400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:d7000_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.66 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:d7000:v2:*:*:*:*:*:*:* Versions v2 Running on ·NETGEAR
  • cpe:2.3:o:netgear:d8500_firmware:*:*:*:*:*:*:*:* Versions before 1.0.3.60 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:d8500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:dc112a_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.54 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:dc112a:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
Show 62 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:netgear:ex7000_firmware:*:*:*:*:*:*:*:*before 1.0.1.94VulnerableNETGEAR
cpe:2.3:h:netgear:ex7000:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:ex7500_firmware:*:*:*:*:*:*:*:*before 1.0.0.72VulnerableNETGEAR
cpe:2.3:h:netgear:ex7500:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6250_firmware:*:*:*:*:*:*:*:*before 1.0.4.48VulnerableNETGEAR
cpe:2.3:h:netgear:r6250:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6300_firmware:*:*:*:*:*:*:*:*before 1.0.4.50VulnerableNETGEAR
cpe:2.3:h:netgear:r6300:v2:*:*:*:*:*:*:*v2Running onNETGEAR
cpe:2.3:o:netgear:r6400_firmware:*:*:*:*:*:*:*:*before 1.0.1.68VulnerableNETGEAR
cpe:2.3:h:netgear:r6400:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r6400_firmware:*:*:*:*:*:*:*:*before 1.0.4.102VulnerableNETGEAR
cpe:2.3:h:netgear:r6400:v2:*:*:*:*:*:*:*v2Running onNETGEAR
cpe:2.3:o:netgear:r6700_firmware:*:*:*:*:*:*:*:*before 1.0.4.102VulnerableNETGEAR
cpe:2.3:h:netgear:r6700:v3:*:*:*:*:*:*:*v3Running onNETGEAR
cpe:2.3:o:netgear:r6900p_firmware:*:*:*:*:*:*:*:*before 1.3.2.132VulnerableNETGEAR
cpe:2.3:h:netgear:r6900p:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r7000_firmware:*:*:*:*:*:*:*:*before 1.0.11.116VulnerableNETGEAR
cpe:2.3:h:netgear:r7000:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r7000p_firmware:*:*:*:*:*:*:*:*before 1.3.2.132VulnerableNETGEAR
cpe:2.3:h:netgear:r7000p:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r7100lg_firmware:*:*:*:*:*:*:*:*before 1.0.0.64VulnerableNETGEAR
cpe:2.3:h:netgear:r7100lg:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r7850_firmware:*:*:*:*:*:*:*:*before 1.0.5.68VulnerableNETGEAR
cpe:2.3:h:netgear:r7850:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r7900_firmware:*:*:*:*:*:*:*:*before 1.0.4.38VulnerableNETGEAR
cpe:2.3:h:netgear:r7900:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r7900p_firmware:*:*:*:*:*:*:*:*before 1.4.1.68VulnerableNETGEAR
cpe:2.3:h:netgear:r7900p:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r7960p_firmware:*:*:*:*:*:*:*:*before 1.4.1.68VulnerableNETGEAR
cpe:2.3:h:netgear:r7960p:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r8000_firmware:*:*:*:*:*:*:*:*before 1.0.4.68VulnerableNETGEAR
cpe:2.3:h:netgear:r8000:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r8000p_firmware:*:*:*:*:*:*:*:*before 1.4.1.68VulnerableNETGEAR
cpe:2.3:h:netgear:r8000p:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r8300_firmware:*:*:*:*:*:*:*:*before 1.0.2.144VulnerableNETGEAR
cpe:2.3:h:netgear:r8300:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:r8500_firmware:*:*:*:*:*:*:*:*before 1.0.2.144VulnerableNETGEAR
cpe:2.3:h:netgear:r8500:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:rax200_firmware:*:*:*:*:*:*:*:*before 1.0.2.88VulnerableNETGEAR
cpe:2.3:h:netgear:rax200:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:rax75_firmware:*:*:*:*:*:*:*:*before 1.0.3.102VulnerableNETGEAR
cpe:2.3:h:netgear:rax75:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:rax80_firmware:*:*:*:*:*:*:*:*before 1.0.3.102VulnerableNETGEAR
cpe:2.3:h:netgear:rax80:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:rbr750_firmware:*:*:*:*:*:*:*:*before 3.2.17.12VulnerableNETGEAR
cpe:2.3:h:netgear:rbr750:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:rbr850_firmware:*:*:*:*:*:*:*:*before 3.2.17.12VulnerableNETGEAR
cpe:2.3:h:netgear:rbr850:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:rbs40v_firmware:*:*:*:*:*:*:*:*before 2.6.2.4VulnerableNETGEAR
cpe:2.3:h:netgear:rbs40v:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:rbs750_firmware:*:*:*:*:*:*:*:*before 3.2.17.12VulnerableNETGEAR
cpe:2.3:h:netgear:rbs750:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:rbs850_firmware:*:*:*:*:*:*:*:*before 3.2.17.12VulnerableNETGEAR
cpe:2.3:h:netgear:rbs850:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:rs400_firmware:*:*:*:*:*:*:*:*up to 1.5.0.68VulnerableNETGEAR
cpe:2.3:h:netgear:rs400:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
cpe:2.3:o:netgear:wndr3400_firmware:*:*:*:*:*:*:*:*before 1.0.1.38VulnerableNETGEAR
cpe:2.3:h:netgear:wndr3400:v3:*:*:*:*:*:*:*v3Running onNETGEAR
cpe:2.3:o:netgear:wnr3500l_firmware:*:*:*:*:*:*:*:*before 1.2.0.66VulnerableNETGEAR
cpe:2.3:h:netgear:wnr3500l:v2:*:*:*:*:*:*:*v2Running onNETGEAR
cpe:2.3:o:netgear:xr300_firmware:*:*:*:*:*:*:*:*before 1.0.3.56VulnerableNETGEAR
cpe:2.3:h:netgear:xr300:-:*:*:*:*:*:*:*not specified by NVDRunning onNETGEAR
  • cpe:2.3:o:netgear:ex7000_firmware:*:*:*:*:*:*:*:* Versions before 1.0.1.94 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:ex7000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:ex7500_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.72 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:ex7500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6250_firmware:*:*:*:*:*:*:*:* Versions before 1.0.4.48 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6250:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6300_firmware:*:*:*:*:*:*:*:* Versions before 1.0.4.50 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6300:v2:*:*:*:*:*:*:* Versions v2 Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6400_firmware:*:*:*:*:*:*:*:* Versions before 1.0.1.68 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6400_firmware:*:*:*:*:*:*:*:* Versions before 1.0.4.102 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6400:v2:*:*:*:*:*:*:* Versions v2 Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6700_firmware:*:*:*:*:*:*:*:* Versions before 1.0.4.102 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6700:v3:*:*:*:*:*:*:* Versions v3 Running on ·NETGEAR
  • cpe:2.3:o:netgear:r6900p_firmware:*:*:*:*:*:*:*:* Versions before 1.3.2.132 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r6900p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7000_firmware:*:*:*:*:*:*:*:* Versions before 1.0.11.116 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7000p_firmware:*:*:*:*:*:*:*:* Versions before 1.3.2.132 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7000p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7100lg_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.64 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7100lg:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7850_firmware:*:*:*:*:*:*:*:* Versions before 1.0.5.68 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7850:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7900_firmware:*:*:*:*:*:*:*:* Versions before 1.0.4.38 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7900:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7900p_firmware:*:*:*:*:*:*:*:* Versions before 1.4.1.68 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7900p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r7960p_firmware:*:*:*:*:*:*:*:* Versions before 1.4.1.68 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r7960p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r8000_firmware:*:*:*:*:*:*:*:* Versions before 1.0.4.68 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r8000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r8000p_firmware:*:*:*:*:*:*:*:* Versions before 1.4.1.68 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r8000p:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r8300_firmware:*:*:*:*:*:*:*:* Versions before 1.0.2.144 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r8300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:r8500_firmware:*:*:*:*:*:*:*:* Versions before 1.0.2.144 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:r8500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:rax200_firmware:*:*:*:*:*:*:*:* Versions before 1.0.2.88 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:rax200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:rax75_firmware:*:*:*:*:*:*:*:* Versions before 1.0.3.102 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:rax75:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:rax80_firmware:*:*:*:*:*:*:*:* Versions before 1.0.3.102 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:rax80:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:rbr750_firmware:*:*:*:*:*:*:*:* Versions before 3.2.17.12 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:rbr750:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:rbr850_firmware:*:*:*:*:*:*:*:* Versions before 3.2.17.12 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:rbr850:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:rbs40v_firmware:*:*:*:*:*:*:*:* Versions before 2.6.2.4 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:rbs40v:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:rbs750_firmware:*:*:*:*:*:*:*:* Versions before 3.2.17.12 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:rbs750:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:rbs850_firmware:*:*:*:*:*:*:*:* Versions before 3.2.17.12 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:rbs850:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:rs400_firmware:*:*:*:*:*:*:*:* Versions up to 1.5.0.68 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:rs400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR
  • cpe:2.3:o:netgear:wndr3400_firmware:*:*:*:*:*:*:*:* Versions before 1.0.1.38 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:wndr3400:v3:*:*:*:*:*:*:* Versions v3 Running on ·NETGEAR
  • cpe:2.3:o:netgear:wnr3500l_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0.66 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:wnr3500l:v2:*:*:*:*:*:*:* Versions v2 Running on ·NETGEAR
  • cpe:2.3:o:netgear:xr300_firmware:*:*:*:*:*:*:*:* Versions before 1.0.3.56 Vulnerable ·NETGEAR
  • cpe:2.3:h:netgear:xr300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NETGEAR

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27239
  2. 2026-10-03 Alias added: GHSA-hqww-3wrx-q5gv

References

Advisory 2

  • TI-2016-05377 NETGEAR R6250 before 1.0.4.6.Beta, R6400 before 1.0.1.18.Beta, R6700 before… KEVCVSS 3.1HIGH 8.8
  • TI-2017-03537 An issue was discovered on NETGEAR R8500, R8300, R7000, R6400, R7300, R7100LG, R6300v2… KEVCVSS 3.1HIGH 8.1
  • TI-2023-16567 Netgear D6220 with Firmware Version 1.0.0.80, D8500 with Firmware Version 1.0.3.60, R6700… CVSS 3.1HIGH 8.8
  • TI-2022-10624 Buffer overflow in NETGEAR R6700v3 CVSS 3.1HIGH 8.8
  • TI-2021-13978 Stack-based buffer overflow in NETGEAR R6400v2 CVSS 3.1HIGH 8.8
  • TI-2021-16116 Certain NETGEAR devices are affected by lack of access control at the function level. CVSS 3.1CRITICAL 10.0
See all 52 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences