CVE-2023-33953

FAUCET Score

CVE-2023-33953 is a high-severity denial-of-service (DoS) vulnerability affecting gRPC, stemming from HPACK table accounting errors. Attackers can exploit unbounded memory buffering and CPU consumption in the HPACK parser to cause service disruptions. This unauthenticated network attack is low complexity, with a CVSS score of 7.5. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 1.53.2CPE matchmatch criteria	cpe:2.3:a:grpc:grpc::::::-::*
		>= 1.54.0, < 1.54.3CPE matchmatch criteria	cpe:2.3:a:grpc:grpc::::::-::*
		>= 1.55.0, < 1.55.2CPE matchmatch criteria	cpe:2.3:a:grpc:grpc::::::-::*
		>= 1.56.0, < 1.56.2CPE matchmatch criteria	cpe:2.3:a:grpc:grpc::::::-::*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

Exploitability Score

3.9

Impact Score

3.6

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.41%

Probability of exploitation in next 30 days

EPSS Percentile

33.8%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0041 is in the 13th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.