Access-control bypass via malformed email address parsing
Published Apr 18, 2023 · Updated May 12, 2026
Improper input validation in Python's email parser in RUGGEDCOM ROX before V2.17.0 allows remote attackers to bypass address-based controls. The parseaddr and getaddresses paths in email/_parseaddr.py accept malformed RFC 2822 input and return the display-name portion as the addr-spec instead of rejecting the address. Exploitation requires an application to authorize the returned value while sending verification or other mail to the actual address, enabling only the application action guarded by that address check.
Summary
What happened
Improper input validation in Python's email parser in RUGGEDCOM ROX before V2.17.0 allows remote attackers to bypass address-based controls. The parseaddr and getaddresses paths in email/_parseaddr.py accept malformed RFC 2822 input and return the display-name portion as the addr-spec instead of rejecting the address. Exploitation requires an application to authorize the returned value while sending verification or other mail to the actual address, enabling only the application action guarded by that address check.
The record
- CVE
- CVE-2023-27043
- Published
- Apr 18, 2023
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- RUGGEDCOM ROX RX1500
- Classifications
- CWE-20
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 18, 2023CVE publishedPublication date reported by the CVE source.
- May 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <V2.17.0
- Affected versionversion=0 <V2.17.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Malformed address parser bypass demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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