CVE-2023-27043 (GCVE-0-2023-27043)
Vulnerability from cvelistv5 – Published: 2023-04-18 00:00 – Updated: 2026-05-12 10:52
VLAI
EPSS
VEX
Summary
The email module of Python through 3.11.3 incorrectly parses e-mail addresses that contain a special character. The wrong portion of an RFC2822 header is identified as the value of the addr-spec. In some applications, an attacker can bypass a protection mechanism in which application access is granted only after verifying receipt of e-mail to a specific domain (e.g., only @company.example.com addresses may be used for signup). This occurs in email/_parseaddr.py in recent versions of Python.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-17 21:27 UTC
CWE
Assigner
References
46 references
Impacted products
22 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Siemens | RUGGEDCOM ROX MX5000 |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX MX5000RE |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1400 |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1500 |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1501 |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1510 |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1511 |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1512 |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1524 |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1536 |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX5000 |
Affected:
0 , < V2.17.1
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX MX5000 |
Affected:
0 , < V2.17.0
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX MX5000RE |
Affected:
0 , < V2.17.0
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1400 |
Affected:
0 , < V2.17.0
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1500 |
Affected:
0 , < V2.17.0
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1501 |
Affected:
0 , < V2.17.0
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1510 |
Affected:
0 , < V2.17.0
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1511 |
Affected:
0 , < V2.17.0
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1512 |
Affected:
0 , < V2.17.0
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1524 |
Affected:
0 , < V2.17.0
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX1536 |
Affected:
0 , < V2.17.0
(custom)
|
guessed | |
| Siemens | RUGGEDCOM ROX RX5000 |
Affected:
0 , < V2.17.0
(custom)
|
guessed |
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"title": "CVE Program Container"
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},
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"vendor": "Siemens",
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{
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"status": "affected",
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},
{
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},
{
"url": "http://seclists.org/fulldisclosure/2025/Apr/8"
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{
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{
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{
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{
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{
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}
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{
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{
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"product": "RUGGEDCOM ROX RX1500",
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"versions": [
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},
{
"defaultStatus": "unknown",
"product": "RUGGEDCOM ROX RX1501",
"vendor": "Siemens",
"versions": [
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"status": "affected",
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{
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{
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"vendor": "Siemens",
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{
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{
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{
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"vendor": "Siemens",
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"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
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},
{
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}
],
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{
"metrics": [
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"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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}
},
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"content": {
"id": "CVE-2023-27043",
"options": [
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"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
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}
],
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"timestamp": "2025-12-17T21:27:39.378751Z",
"version": "2.0.3"
},
"type": "ssvc"
}
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],
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},
{
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]
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],
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},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
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"vendor": "n/a",
"versions": [
{
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}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "The email module of Python through 3.11.3 incorrectly parses e-mail addresses that contain a special character. The wrong portion of an RFC2822 header is identified as the value of the addr-spec. In some applications, an attacker can bypass a protection mechanism in which application access is granted only after verifying receipt of e-mail to a specific domain (e.g., only @company.example.com addresses may be used for signup). This occurs in email/_parseaddr.py in recent versions of Python."
}
],
"problemTypes": [
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},
{
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{
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{
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},
{
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},
{
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{
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"assignerShortName": "mitre",
"cveId": "CVE-2023-27043",
"datePublished": "2023-04-18T00:00:00.000Z",
"dateReserved": "2023-02-27T00:00:00.000Z",
"dateUpdated": "2026-05-12T10:52:16.478Z",
"state": "PUBLISHED"
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"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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