CVE-2022-38333Network attack vector

Information disclosure via HTTP header overreads

Published Sep 19, 2022 · Updated Aug 3, 2024

Out-of-bounds reads in OpenWrt before 21.02.3 and 22.03.0-rc6 allow remote attackers to disclose memory via crafted HTTP headers. The cgi-io header_value() parser advances past the supplied buffer in two loops that fail to stop when the remaining length reaches zero. An unauthenticated network request can trigger two one-byte overreads, exposing adjacent process memory without modifying data or interrupting service.

CVSS severity7.5
High
EPSS probability1.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds reads in OpenWrt before 21.02.3 and 22.03.0-rc6 allow remote attackers to disclose memory via crafted HTTP headers. The cgi-io header_value() parser advances past the supplied buffer in two loops that fail to stop when the remaining length reaches zero. An unauthenticated network request can trigger two one-byte overreads, exposing adjacent process memory without modifying data or interrupting service.

The record

CVE
CVE-2022-38333
Published
Sep 19, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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