HOMEVULNERABILITIESCVE-2023-30847
HIGH

CVE-2023-30847

CWE-824Published: April 27, 2023· Updated: Jun 17, 2026

8.2
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-30847 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 8.2.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Affected Vendors & Products

dena1 product(s)
h2o
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33
PATCHhttps://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx
PATCHhttps://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33
PATCHhttps://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx
ADVISORYhttps://github.com/h2o/h2o/pull/3229
ADVISORYhttps://github.com/h2o/h2o/pull/3229

All References (6)

→
https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33Patch
→
https://github.com/h2o/h2o/pull/3229Vendor Advisory
→
https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvxPatch · Vendor Advisory
→
https://github.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33Patch
→
https://github.com/h2o/h2o/pull/3229Vendor Advisory
→
https://github.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvxPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2023-30847
CVSS Score8.2 / 10
SeverityHIGH
WeaknessCWE-824
CISA KEVNo
Affected1 vendor(s)
PublishedApr 27, 2023

Related CVEs (CWE-824)

CVE-2007-2442
10.0
CVE-2009-0846
10.0
CVE-2020-25573
9.8
CVE-2020-11138
9.8
CVE-2020-17446
9.8
CVE-2018-11743
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-30847 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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