CVE-2021-34588Network attack vector

Unauthenticated backup export via empty post-reboot key

Published Apr 27, 2022 · Updated Sep 16, 2024

Forced browsing in Bender CC612, CC613, ICC15xx, and ICC16xx firmware allows remote attackers to export backups without authentication. The backup-export endpoint checks a random key that is initialized only at user login and remains empty after a controller reboot. Before any user logs in, an unauthenticated network request using the empty key can retrieve the controller backup and expose its contents.

CVSS severity8.6
High
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Forced browsing in Bender CC612, CC613, ICC15xx, and ICC16xx firmware allows remote attackers to export backups without authentication. The backup-export endpoint checks a random key that is initialized only at user login and remains empty after a controller reboot. Before any user logs in, an unauthenticated network request using the empty key can retrieve the controller backup and expose its contents.

The record

CVE
CVE-2021-34588
Published
Apr 27, 2022
Updated
Sep 16, 2024
Vendor
Bender GmbH & Co. KG
Product
CC612
Classifications
CWE-425, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=5.11.x <5.11.2
  2. Affected versionversion=5.12.x <5.12.5
  3. Affected versionversion=5.13.x <5.13.2
  4. Affected versionversion=5.20.x <5.20.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Bender GmbH & Co. KG · CC612version=5.11.x <5.11.2; version=5.12.x <5.12.5; version=5.13.x <5.13.2; version=5.20.x <5.20.2
Bender GmbH & Co. KG · ICC16xxversion=5.11.x <5.11.2; version=5.12.x <5.12.5; version=5.13.x <5.13.2; version=5.20.x <5.20.2
Bender GmbH & Co. KG · CC613version=5.11.x <5.11.2; version=5.12.x <5.12.5; version=5.13.x <5.13.2; version=5.20.x <5.20.2
Bender GmbH & Co. KG · ICC15xxversion=5.11.x <5.11.2; version=5.12.x <5.12.5; version=5.13.x <5.13.2; version=5.20.x <5.20.2

Published CVSS scores

8.6CERT@VDECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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.

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-425Direct Request ('Forced Browsing')
T1005Data from Local System

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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