CVE-2021-45504: Certain NETGEAR devices are affected by authentication bypass.
Noroxi assessment
Priority: Monitor (action score 39/100)
- 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: 1.1% (FIRST EPSS); higher than 67.7% of all records.
- 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 the record, no fixed version is available yet.
Low priority for now. Update when a fix is released; follow the vendor's advisory.
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
Certain NETGEAR devices are affected by authentication bypass. This affects CBR40 before 2.5.0.24, CBR750 before 4.6.3.6, RBR852 before 3.2.17.12, RBR850 before 3.2.17.12, and RBS850 before 3.2.17.12.
- Published
- Dec 25, 2021
- Updated
- Jun 17, 2026
- EPSS
- 1.1% · 67th percentile
- CWE
- —
Report tools
Action score
39
Monitor
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.1%
CNA vs NVD score
- NVD
- 9.8
- CNA · mitre
- 9.6
- 0.2 point gap
CVSS:3.1/AC:L/AV:A/A:H/C:H/I:H/PR:N/S:C/UI:N
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
- No fixed version yet
If any of these changes, we'll tell you in the daily email digest.
Running WordPress? Scan your site free with WP Lens
Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| netgear | cbr40 firmware | cpe:2.3:o:netgear:cbr40_firmware |
| netgear | cbr40 | cpe:2.3:h:netgear:cbr40 |
| netgear | cbr750 firmware | cpe:2.3:o:netgear:cbr750_firmware |
| netgear | cbr750 | cpe:2.3:h:netgear:cbr750 |
| netgear | rbr850 firmware | cpe:2.3:o:netgear:rbr850_firmware |
| netgear | rbr850 | cpe:2.3:h:netgear:rbr850 |
| netgear | rbr852 firmware | cpe:2.3:o:netgear:rbr852_firmware |
| netgear | rbr852 | cpe:2.3:h:netgear:rbr852 |
| netgear | rbs850 firmware | cpe:2.3:o:netgear:rbs850_firmware |
| netgear | rbs850 | cpe:2.3:h:netgear:rbs850 |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- netgear cbr40 firmwarebefore 2.5.0.24
- netgear cbr750 firmwarebefore 4.6.3.6
- netgear rbr850 firmwarebefore 3.2.17.12
- netgear rbr852 firmwarebefore 3.2.17.12
- netgear rbs850 firmwarebefore 3.2.17.12
Same product
netgear: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-45622Certain NETGEAR devices are affected by command injection by an unauthenticated attacker.40Plan
- CVE-2021-45621Certain NETGEAR devices are affected by command injection by an unauthenticated attacker.40Plan
- CVE-2021-45620Certain NETGEAR devices are affected by command injection by an unauthenticated attacker.40Plan
Published before and after this one in the same product
- ← EarlierCVE-2020-35802Dec 29, 2020 · Certain NETGEAR devices are affected by disclosure of sensitive information.30Monitor
- ← EarlierCVE-2021-38527Aug 10, 2021 · Certain NETGEAR devices are affected by command injection by an unauthenticated attacker.40Plan
- Later →CVE-2021-45507Dec 25, 2021 · Certain NETGEAR devices are affected by authentication bypass.39Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
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.
No commit or PR link among the references.
Credits
All researchersFinders, 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.
—
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
- CVE-2021-455970 days apartCertain NETGEAR devices are affected by command injection by an authenticated user.35Monitor
- CVE-2021-455980 days apartCertain NETGEAR devices are affected by command injection by an authenticated user.35Monitor
- CVE-2021-455990 days apartCertain NETGEAR devices are affected by command injection by an authenticated user.35Monitor
- CVE-2021-456010 days apartCertain NETGEAR devices are affected by command injection by an authenticated user.35Monitor
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
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.