CVE-2021-33543Public exploitNetwork attack vector

Unauthenticated sensitive-file access via rewrite-rule bypass

Published Sep 13, 2021 · Updated Aug 3, 2024

Authentication bypass in Geutebrück G-Cam/E2 Series and Encoder G-Code firmware allows remote attackers to access protected CGI files. The lighttpd rewrite rule matches only paths beginning with one slash, so double-slash or traversal-form requests reach /uapi-cgi files without HTTP Digest authentication. No credentials or user interaction are required; exposed CGI functions permit sensitive-file access, device manipulation, and service interruption.

CVSS severity9.8
Critical
EPSS probability81.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Geutebrück G-Cam/E2 Series and Encoder G-Code firmware allows remote attackers to access protected CGI files. The lighttpd rewrite rule matches only paths beginning with one slash, so double-slash or traversal-form requests reach /uapi-cgi files without HTTP Digest authentication. No credentials or user interaction are required; exposed CGI functions permit sensitive-file access, device manipulation, and service interruption.

The record

CVE
CVE-2021-33543
Published
Sep 13, 2021
Updated
Aug 3, 2024
Vendor
Geutebrück
Product
G-Cam/E2 Series
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 2021CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=EBC-21xx <=1.12.0.27
  2. Affected versionversion=EBC-21xx 1.12.13.2
  3. Affected versionversion=EBC-21xx 1.12.14.5
  4. Affected versionversion=EFD-22xx <=1.12.0.27
  5. Affected versionversion=EFD-22xx 1.12.13.2
  6. Affected versionversion=EFD-22xx 1.12.14.5
  7. Affected versionversion=ETHC-22xx <=1.12.0.27
  8. Affected versionversion=ETHC-22xx 1.12.13.2
  9. Affected versionversion=ETHC-22xx 1.12.14.5
  10. Affected versionversion=EWPC-22xx <=1.12.0.27
  11. Affected versionversion=EWPC-22xx 1.12.13.2
  12. Affected versionversion=EWPC-22xx 1.12.14.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Geutebrück · G-Cam/E2 Seriesversion=EBC-21xx <=1.12.0.27; version=EBC-21xx 1.12.13.2; version=EBC-21xx 1.12.14.5; version=EFD-22xx <=1.12.0.27; version=EFD-22xx 1.12.13.2; version=EFD-22xx 1.12.14.5; version=ETHC-22xx <=1.12.0.27; version=ETHC-22xx 1.12.13.2; version=ETHC-22xx 1.12.14.5; version=EWPC-22xx <=1.12.0.27; version=EWPC-22xx 1.12.13.2; version=EWPC-22xx 1.12.14.5
Geutebrück · Encoder G-Codeversion=EEC-2xx <=1.12.0.27; version=EEC-2xx 1.12.13.2; version=EEC-2xx 1.12.14.5; version=EEN-20xx <=1.12.0.27; version=EEN-20xx 1.12.13.2; version=EEN-20xx 1.12.14.5

Published CVSS scores

9.8CERT VDECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

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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