CVE-2022-27646
A public proof of concept exists; no exploitation attested.
- Published2023-03-29
- Fixed in2.5.0.28
- WeaknessCWE-121
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6700v3 1.0.4.120_10.0.91 routers. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the circled daemon. A crafted circleinfo.txt file 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-15879.
Timeline
dates in UTC- 2023-03-2919:15CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-27646?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-27646?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.5 | < 2.5.0.28 | 2.5.0.28 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.7 | < 2.7.4.2 | 2.7.4.2 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.7 | < 2.7.4.2 | 2.7.4.2 | NVD |
21 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Netgear cbr40 firmware to 2.5.0.28
Advisories and patches
- kb.netgear.comVendor Advisory
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 1 repository, unverifiedcyber-defence-campus/netgear_r6700v3_circled PoC-in-GitHub
Sources
- CISA-ADPSSVC decisionnone2025-02-18
- OpenCVESSVC decisionnone—
- NVDCVSS 3.18.8read 2026-10-23
- CNACVSS 3.08read 2026-10-23
- CNAweakness (CWE)CWE-121read 2026-10-23
- FIRST EPSSEPSS score1.4 %2026-10-23
- PoC-in-GitHubproof of concept1read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2023-03-29
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2022-27646?
Is CVE-2022-27646 actively exploited?
What is the CVSS score for CVE-2022-27646?
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