CVE-2023-35838

mediumpriority · track · 23EPSS 0.007 · 53 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.69% (53rd) EPSS

CVSS 5.7 · medium

Is it mine?

9 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.7

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.7mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 2.1 · impact 3.6

v3.15.7mediumAV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.15.7mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hsecondary · OSV

v3.15.2mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-610USprimaryCWE-610US

affected products (9)

Products and version ranges known to be affected.

SonicWall SMA 100all versionscert_bundDEcpe:/a:sonicwall:secure_mobile_access:100
SonicWall SMA 1000all versionscert_bundDEcpe:/a:sonicwall:secure_mobile_access:1000
SonicWall SMA Connect Tunnelall versionscert_bundDEcpe:/a:sonicwall:secure_mobile_access:connect_tunnel
SonicWall SMA Mobile Connectall versionscert_bundDEcpe:/a:sonicwall:secure_mobile_access:mobile_connect
SonicWall SMA NetExtenderall versionscert_bundDEcpe:/a:sonicwall:secure_mobile_access:netextender
n/a n/a≤ n/aenisa_euvdEU
Jason A. Donenfeld WireGuard≤ 0.5.3fstec_bduRU
wireguard wireguard= 0.5.3nvdUScpe:2.3:a:wireguard:wireguard:*:*:*:*:*:*:*:*
PyPI wireguard≤ 0.5.3osvUSpkg:pypi/wireguard

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-2781SonicWall SMA: Mehrere Schwachstellen ermöglichen Offenlegung von InformationenDeutsch2023-10-30csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in SonicWall SMA ausnutzen, um Informationen offenzulegen.
PYSEC-2023-3212023-08-09vendor · osvUS
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.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd osv NVD CVE.org MITRE

published 2023-08-09modified 2026-06-17

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+252 more

references (12)

External citations — patches, advisories, analysis.

scry

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