CVE-2023-36673

highpriority · track · 29OT risk · elevatedEPSS 0.005 · 45 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.53% (45th) EPSS

CVSS 7.3 · high

Is it mine?

10 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

An issue was discovered in Avira Phantom VPN through 2.23.1 for macOS. The VPN client insecurely configures the operating system such that all IP traffic to the VPN server's IP address is sent in plaintext outside the VPN tunnel, even if this traffic is not generated by the VPN client, while simultaneously using plaintext DNS to look up the VPN server's IP address. This allows an adversary to trick the victim into sending traffic to arbitrary IP addresses in plaintext outside the VPN tunnel. NOTE: the tunnelcrack.mathyvanhoef.com website uses this CVE ID to refer more generally to "ServerIP attack, combined with DNS spoofing, that can leak traffic to an arbitrary IP address" rather than to only Avira Phantom VPN.

cvss

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

7.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.7–7.3

v3.17.3highCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Nprimary · NVD / NIST USexploitability 2.1 · impact 5.2

v3.17.3highAV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.16.7mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

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

Exploitation: poc · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-319USprimaryCWE-319US

affected products (10)

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
Avira Operations GmBH & Co. KG Avira Phantom VPN≤ 2.23.1fstec_bduRU
Cisco Systems Inc. AnyConnect Secure Mobility Clientall versionsfstec_bduRU
Cisco Systems Inc. Cisco Secure Clientall versionsfstec_bduRU
avira phantom vpn≤ 2.23.1nvdUScpe:2.3:a:avira:phantom_vpn:*:*:*:*:*:*:*:*

advisories (1)

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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd NVD CVE.org MITRE

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

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+1178 more

references (14)

External citations — patches, advisories, analysis.

scry

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