PYSEC-2023-321
Vulnerability from pysec - Published: 2023-08-09 23:15 - Updated: 2026-05-20 09:19
VLAI?
Details
The WireGuard client 0.5.3 on Windows insecurely configures the operating system and firewall such that traffic to a local network that uses non-RFC1918 IP addresses is blocked. This allows an adversary to trick the victim into blocking IP traffic to selected IP addresses and services even while the VPN is enabled. NOTE: the tunnelcrack.mathyvanhoef.com website uses this CVE ID to refer more generally to "LocalNet attack resulting in the blocking of traffic" rather than to only WireGuard.
Severity ?
5.7 (Medium)
Impacted products
| Name | purl | wireguard | pkg:pypi/wireguard |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "wireguard",
"purl": "pkg:pypi/wireguard"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.1.0",
"0.1.1",
"0.1.2",
"0.1.3",
"0.1.4",
"0.1.5",
"0.1.6",
"0.2.0",
"0.2.1",
"0.2.2",
"0.2.3",
"0.2.4",
"0.2.5",
"0.3.0",
"0.4.0",
"1.0.0",
"1.0.1",
"1.0.2"
]
}
],
"aliases": [
"CVE-2023-35838"
],
"details": "The WireGuard client 0.5.3 on Windows insecurely configures the operating system and firewall such that traffic to a local network that uses non-RFC1918 IP addresses is blocked. This allows an adversary to trick the victim into blocking IP traffic to selected IP addresses and services even while the VPN is enabled. NOTE: the tunnelcrack.mathyvanhoef.com website uses this CVE ID to refer more generally to \"LocalNet attack resulting in the blocking of traffic\" rather than to only WireGuard.",
"id": "PYSEC-2023-321",
"modified": "2026-05-20T09:19:24.310411Z",
"published": "2023-08-09T23:15:10.007Z",
"references": [
{
"type": "WEB",
"url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0015"
},
{
"type": "WEB",
"url": "https://wireguard.com"
},
{
"type": "EVIDENCE",
"url": "https://tunnelcrack.mathyvanhoef.com/details.html"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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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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