CVE-2021-23853Network attack vector

HTTP header injection via crafted URLs

Published Jun 9, 2021 · Updated Sep 17, 2024

HTTP header injection in Bosch CPP Firmware allows remote attackers to inject arbitrary HTTP headers through crafted camera URLs. The camera web service parses attacker-controlled URL data as HTTP header content instead of keeping URL and header fields separate. The attack requires a user with network access to TCP port 80 or 443 to open the crafted URL; Bosch reports arbitrary header injection but no narrower consequence.

CVSS severity8.3
High
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP header injection in Bosch CPP Firmware allows remote attackers to inject arbitrary HTTP headers through crafted camera URLs. The camera web service parses attacker-controlled URL data as HTTP header content instead of keeping URL and header fields separate. The attack requires a user with network access to TCP port 80 or 443 to open the crafted URL; Bosch reports arbitrary header injection but no narrower consequence.

The record

CVE
CVE-2021-23853
Published
Jun 9, 2021
Updated
Sep 17, 2024
Vendor
Bosch Security Systems B.V.
Product
CPP Firmware
Classifications
CWE-20, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

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  1. Affected versionversion=all

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Bosch Security Systems B.V. · CPP Firmwareversion=all

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.3Robert Bosch GmbHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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-20Improper Input Validation
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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