CVE-2026-48692: FastNetMon Community Edition through 1.2.9 exposes a gRPC API server on port 50052 with no authentication mech

Q: How do I fix CVE-2026-48692?

fastnetmon: upgrade to newer than 1.2.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-48692 being exploited?

CVE-2026-48692 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-48692 affect?

CVE-2026-48692 affects fastnetmon. Severity is high (CVSS 8.1). FastNetMon Community Edition through 1.2.9 exposes a gRPC API server on port 50052 with no authentication mechanism. The server is initialized with grpc::InsecureServerCredentials() (src/fastnetmon.cpp line 477) and a source code comment ex

Routine

HIGH 8.1UPGRADE

CVE-2026-48692 is a high-severity flaw (CVSS 8.1) affecting fastnetmon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FastNetMon Community Edition through 1.2.9 exposes a gRPC API server on port 50052 with no authentication mechanism. The server is initialized with grpc::InsecureServerCredentials() (src/fastnetmon.cpp line 477) and a source code comment explicitly acknowledges 'Listen on the given address without any authentication mechanism.' None of the RPC methods in src/api.cpp (ExecuteBan, ExecuteUnBan, GetBanlist, GetTotalTrafficCounters, etc.) perform any

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-05-26
Last modified	2026-07-24

Publisher (CNA): MITRE · Vendor: pavel-odintsov

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-26 16:16 UTCPublished CVE record published
2026-07-24 11:10 UTCUpdated Record last modified

pavel-odintsov fastnetmon UPGRADE

Affected: <= 1.2.9

Fixed in: newer than 1.2.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fastnetmon || rpm -q fastnetmon || fastnetmon --version

2. UPGRADE to newer than 1.2.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fastnetmon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fastnetmon

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2026-48692?

fastnetmon: upgrade to newer than 1.2.9. Exact commands for each OS are on this page.

Is CVE-2026-48692 being exploited?

CVE-2026-48692 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-2026-48692 affect?

CVE-2026-48692 affects fastnetmon. Severity is high (CVSS 8.1). FastNetMon Community Edition through 1.2.9 exposes a gRPC API server on port 50052 with no authentication mechanism. The server is initialized with grpc::InsecureServerCredentials() (src/fastnetmon.cpp line 477) and a source code comment ex

How urgent is CVE-2026-48692?

Priority 32/100. High severity

Related CVEs

CVE-2026-48689 CRITICAL 9.8 UPGRADE FastNetMon Community Edition through 1.2.9 contains an off-by-one heap-based buffer overflow in the dynamic_bi
CVE-2026-48686 CRITICAL 9.8 UPGRADE FastNetMon Community Edition through 1.2.9 contains a stack-based buffer overflow in the BGP NLRI (Network Lay
CVE-2026-48691 CRITICAL 9.8 UPGRADE FastNetMon Community Edition through 1.2.9 contains an integer overflow in the BGP AS_PATH attribute encoder
CVE-2026-48688 HIGH 7.5 UPGRADE FastNetMon Community Edition through 1.2.9 contains multiple out-of-bounds reads in the BGP MP_REACH_NLRI IPv6
CVE-2026-48684 MEDIUM 6.5 UPGRADE FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the NetFlow v9 options template p

References

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