CVE-2022-22707Network attack vector

Remote daemon crash via Forwarded offset overwrite

Published Jan 6, 2022 · Updated Aug 3, 2024

Stack-based buffer overflow in lighttpd 1.4.46 through 1.4.63 allows remote attackers to crash the daemon via a Forwarded header. The mod_extforward_Forwarded parser lets its offsets index reach the array length, then pre-increments it and writes a four-byte -1 past the stack buffer. Reachability requires mod_extforward to trust a proxy and parse Forwarded headers; adverse behavior was observed on 32-bit canary-enabled builds, while standard optimized 64-bit builds did not exhibit it.

CVSS severity5.9
Medium
EPSS probability8.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in lighttpd 1.4.46 through 1.4.63 allows remote attackers to crash the daemon via a Forwarded header. The mod_extforward_Forwarded parser lets its offsets index reach the array length, then pre-increments it and writes a four-byte -1 past the stack buffer. Reachability requires mod_extforward to trust a proxy and parse Forwarded headers; adverse behavior was observed on 32-bit canary-enabled builds, while standard optimized 64-bit builds did not exhibit it.

The record

CVE
CVE-2022-22707
Published
Jan 6, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 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

5.9Canonical Ubuntu SecurityCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-787Out-of-bounds Write
T1499.004Application or System Exploitation

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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