CVE-2023-4785High· 7.5▾ Twilight

Denial of Service Vulnerability in gRPC TCP Server (Posix-compatible platforms)

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score41/ 100 · Moderate

impact 41.3 · likelihood 0.2 · exploitation 0

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.

…

Published

Sep 13, 2023

Updated

Sep 10, 2026

CVSS

7.5

Vendor

grpc

Product

grpc

CWE

—

Depth score

41 · Moderate

EPSS

0.77% · p56

Platforms

—

Source

OSV

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS history

Exploit-prediction probability, daily snapshots since Jul 29.

0.7% → 0.8%▲ 0.1%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 1098 days

Sep 13, 2023Published
Disclosed via OSV
Jul 29, 2026EPSS first tracked
0.7%
Sep 10, 2026Record revised
Last analysed / modified upstream
Sep 15, 2026EPSS peak
0.7% → 0.8%

grpc #osv #rubygems

Affected

grpc >= 1.56.0, < 1.56.2
grpc >= 1.55.0, < 1.55.3
grpc >= 1.54.0, < 1.54.3
grpc >= 1.53.0, < 1.53.2
grpcio >= 1.55.0, < 1.55.3
grpcio >= 1.54.0, < 1.54.3
grpcio >= 1.53.0, < 1.53.2

Patched in

grpc 1.56.2
grpc 1.55.3
grpc 1.54.3
grpc 1.53.2
grpcio 1.55.3
grpcio 1.54.3
grpcio 1.53.2

Full technical detail▾

Overview

Lack of error handling in the TCP server in Google's gRPC starting version 1.23 on posix-compatible platforms (ex. Linux) allows an attacker to cause a denial of service by initiating a significant number of connections with the server. Note that gRPC C++ Python, and Ruby are affected, but gRPC Java, and Go are NOT affected.

Affected packages

grpc >= 1.56.0, < 1.56.2
grpc >= 1.55.0, < 1.55.3
grpc >= 1.54.0, < 1.54.3
grpc >= 1.53.0, < 1.53.2
grpcio >= 1.55.0, < 1.55.3
grpcio >= 1.54.0, < 1.54.3
grpcio >= 1.53.0, < 1.53.2

Remediation

Upgrade to a patched release:

grpc 1.56.2
grpc 1.55.3
grpc 1.54.3
grpc 1.53.2
grpcio 1.55.3
grpcio 1.54.3
grpcio 1.53.2

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#osv#rubygems

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CVE-2023-4785High· 7.5▾ Twilight

Denial of Service Vulnerability in gRPC TCP Server (Posix-compatible platforms)

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score41/ 100 · Moderate

impact 41.3 · likelihood 0.2 · exploitation 0

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.

…

Published

Sep 13, 2023

Updated

Sep 10, 2026

CVSS

7.5

Vendor

grpc

Product

grpc

CWE

—

Depth score

41 · Moderate

EPSS

0.77% · p56

Platforms

—

Source

OSV

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS history

Exploit-prediction probability, daily snapshots since Jul 29.

0.7% → 0.8%▲ 0.1%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 1098 days

Sep 13, 2023Published
Disclosed via OSV
Jul 29, 2026EPSS first tracked
0.7%
Sep 10, 2026Record revised
Last analysed / modified upstream
Sep 15, 2026EPSS peak
0.7% → 0.8%

grpc #osv #rubygems

Affected

grpc >= 1.56.0, < 1.56.2
grpc >= 1.55.0, < 1.55.3
grpc >= 1.54.0, < 1.54.3
grpc >= 1.53.0, < 1.53.2
grpcio >= 1.55.0, < 1.55.3
grpcio >= 1.54.0, < 1.54.3
grpcio >= 1.53.0, < 1.53.2

Patched in

grpc 1.56.2
grpc 1.55.3
grpc 1.54.3
grpc 1.53.2
grpcio 1.55.3
grpcio 1.54.3
grpcio 1.53.2

Full technical detail▾

Overview

Affected packages

grpc >= 1.56.0, < 1.56.2
grpc >= 1.55.0, < 1.55.3
grpc >= 1.54.0, < 1.54.3
grpc >= 1.53.0, < 1.53.2
grpcio >= 1.55.0, < 1.55.3
grpcio >= 1.54.0, < 1.54.3
grpcio >= 1.53.0, < 1.53.2

Remediation

Upgrade to a patched release:

grpc 1.56.2
grpc 1.55.3
grpc 1.54.3
grpc 1.53.2
grpcio 1.55.3
grpcio 1.54.3
grpcio 1.53.2

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#osv#rubygems