CVE-2023-30847
H2O vulnerable to read from uninitialized pointer in the reverse proxy handler
Description
H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later.
INFO
Published Date :
April 27, 2023, 3:15 p.m.
Last Modified :
Nov. 21, 2024, 8 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the affected packages.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2023-30847.
| URL | Resource |
|---|---|
| https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33 | Patch |
| https://github.com/h2o/h2o/pull/3229 | Vendor Advisory |
| https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx | Patch Vendor Advisory |
| https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33 | Patch |
| https://github.com/h2o/h2o/pull/3229 | Vendor Advisory |
| https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx | Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-30847 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-30847
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2023-30847 vulnerability anywhere in the article.
-
Daily CyberSecurity
Google Uses AI to Fight Ad Fraud, Reducing Invalid Traffic by 40%
Google recently announced that it has begun leveraging large language models (LLMs) to combat “invalid traffic” (IVT)—fraudulent or disruptive ad activity—reducing its prevalence by as much as 40%. Th ... Read more
-
Daily CyberSecurity
Insyde UEFI Flaw (CVE-2025-4275): Secure Boot Bypass Allows Rootkits & Undetectable Malware
A newly disclosed vulnerability in Insyde H2O UEFI firmware, tracked as CVE-2025-4275, allows attackers to bypass Secure Boot protections by injecting rogue digital certificates into a poorly protecte ... Read more
-
Daily CyberSecurity
High-Severity DoS Vulnerability Found in PowerDNS DNSdist (CVE-2025-30194)
The PowerDNS team has issued a high-severity security advisory—CVE-2025-30194—regarding a newly discovered denial-of-service (DoS) vulnerability in DNSdist, the company’s DNS load balancer. The flaw a ... Read more
The following table lists the changes that have been made to the
CVE-2023-30847 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33 Added Reference https://github.com/h2o/h2o/pull/3229 Added Reference https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
May. 09, 2023
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H Changed Reference Type https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33 No Types Assigned https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33 Patch Changed Reference Type https://github.com/h2o/h2o/pull/3229 No Types Assigned https://github.com/h2o/h2o/pull/3229 Vendor Advisory Changed Reference Type https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx No Types Assigned https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx Patch, Vendor Advisory Added CPE Configuration OR *cpe:2.3:a:dena:h2o:*:*:*:*:*:*:*:* versions up to (including) 2.2.6 *cpe:2.3:a:dena:h2o:2.3.0:beta1:*:*:*:*:*:* *cpe:2.3:a:dena:h2o:2.3.0:beta2:*:*:*:*:*:*
Vulnerability Scoring Details
Base CVSS Score: 8.2
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.26 }} -0.21%
score
0.49205
percentile