PatchTheCVECVE-2022-4873: On Netcomm router models NF20MESH, NF20, and NL1902 a stack based buffer overflow affects the sessionKey param
CVE-2022-4873 is a critical-severity flaw (CVSS 9.8) affecting nf20 firmware, nf20mesh firmware, nl1902 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
On Netcomm router models NF20MESH, NF20, and NL1902 a stack based buffer overflow affects the sessionKey parameter. By providing a specific number of bytes, the instruction pointer is able to be overwritten on the stack and crashes the application at a known location.
Why this priority
- Critical severity
- EPSS top 6%: very likely to be exploited
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 7.2% (top 6%) |
| CISA exploited list | No |
| Weakness | CWE-787 |
| Published | 2023-01-11 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2022-4873?
nf20 firmware: upgrade to r6b025; nf20mesh firmware: upgrade to r6b025; nl1902 firmware: upgrade to r6b025. Exact commands for each OS are on this page.
Is CVE-2022-4873 being exploited?
CVE-2022-4873 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2022-4873 affect?
CVE-2022-4873 affects nf20 firmware, nf20mesh firmware, nl1902 firmware. Severity is critical (CVSS 9.8). On Netcomm router models NF20MESH, NF20, and NL1902 a stack based buffer overflow affects the sessionKey parameter. By providing a specific number of bytes, the instruction pointer is able to be overwritten on the stack and crashes the appl
How urgent is CVE-2022-4873?
Priority 68/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2022-4874 HIGH 7.5 UPGRADE UPGRADE Authentication bypass in Netcomm router models NF20MESH, NF20, and NL1902 allows an unauthenticated user to ac