CVE-2021-27251
HIGHCVSS 8.8/10EPSS 0.73%
Last modified
CVE-2021-27251 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Authentication is not required to exploit this vulnerability The specific flaw exists within handling of firmware updates. EPSS estimates a 0.73% chance of exploitation in the next 30 days.
Description
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Authentication is not required to exploit this vulnerability The specific flaw exists within handling of firmware updates. The issue results from a fallback to a insecure protocol to deliver updates. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12308.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Netgear | Br200 Firmware | < 5.10.0.5 |
| Netgear | Br500 Firmware | < 5.10.0.5 |
| Netgear | D7800 Firmware | < 1.0.1.60 |
| Netgear | Ex6100v2 Firmware | < 1.0.1.98 |
| Netgear | Ex6150 Firmware | < 1.0.1.98 |
| Netgear | Ex6250 Firmware | < 1.0.0.134 |
| Netgear | Ex6400 Firmware | < 1.0.2.158 |
| Netgear | Ex6400v2 Firmware | < 1.0.0.134 |
| Netgear | Ex6410 Firmware | < 1.0.0.134 |
| Netgear | Ex6420 Firmware | < 1.0.0.134 |
| Netgear | Ex7300 Firmware | < 1.0.2.158 |
| Netgear | Ex7300v2 Firmware | < 1.0.0.134 |
| Netgear | Ex7320 Firmware | < 1.0.0.134 |
| Netgear | Ex7700 Firmware | < 1.0.0.216 |
| Netgear | Ex8000 Firmware | < 1.0.1.232 |
| Netgear | Lbr20 Firmware | < 2.6.3.50 |
| Netgear | R7800 Firmware | < 1.0.2.80 |
| Netgear | R8900 Firmware | < 1.0.5.28 |
| Netgear | R9000 Firmware | < 1.0.5.28 |
| Netgear | Rbk12 Firmware | < 2.7.2.104 |
| Netgear | Rbk13 Firmware | < 2.7.2.104 |
| Netgear | Rbk14 Firmware | < 2.7.2.104 |
| Netgear | Rbk15 Firmware | < 2.7.2.104 |
| Netgear | Rbk20 Firmware | < 2.6.2.104 |
| Netgear | Rbk23 Firmware | < 2.7.2.104 |
| Netgear | Rbk40 Firmware | < 2.6.2.104 |
| Netgear | Rbk43 Firmware | < 2.6.2.104 |
| Netgear | Rbk43s Firmware | < 2.6.2.104 |
| Netgear | Rbk44 Firmware | < 2.6.2.104 |
| Netgear | Rbk50 Firmware | < 2.7.2.104 |
| Netgear | Rbk53 Firmware | < 2.7.2.104 |
| Netgear | Rbr10 Firmware | < 2.6.2.104 |
| Netgear | Rbr20 Firmware | < 2.6.2.104 |
| Netgear | Rbr40 Firmware | < 2.6.2.104 |
| Netgear | Rbr50 Firmware | < 2.7.2.104 |
| Netgear | Rbs10 Firmware | < 2.6.2.104 |
| Netgear | Rbs20 Firmware | < 2.6.2.104 |
| Netgear | Rbs40 Firmware | < 2.6.2.104 |
| Netgear | Rbs50 Firmware | < 2.7.2.104 |
| Netgear | Rbs50y Firmware | < 2.6.2.104 |
| Netgear | Xr450 Firmware | < 2.3.2.114 |
| Netgear | Xr500 Firmware | < 2.3.2.114 |
| Netgear | Xr700 Firmware | < 1.0.1.38 |
References
- https://www.zerodayinitiative.com/advisories/ZDI-21-247/Third Party Advisory, VDB Entry
- https://www.zerodayinitiative.com/advisories/ZDI-21-247/Third Party Advisory, VDB Entry
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27251?
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Authentication is not required to exploit this vulnerability The specific flaw exists within handling of firmware updates. The issue results from a fallback to a insecure protocol to deliver updates. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12308.
How severe is CVE-2021-27251?
CVE-2021-27251 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27251?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-27251?
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Scan your code nowSource: NVD / NIST