CVE-2004-0375

Client Firewall vulnerability

CVSS

5.0

EPSS

8.8%

EPSS pct

95th

Exploited

No known

SYMNDIS.SYS in Symantec Norton Internet Security 2003 and 2004, Norton Personal Firewall 2003 and 2004, Client Firewall 5.01 and 5.1.1, and Client Security 1.0 and 1.1 allow remote attackers to cause a denial of service (infinite loop) via a TCP packet with (1) SACK option or (2) Alternate Checksum Data option followed by a length of zero.

Affected vendor

Symantec

Affected product

Client Firewall

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Published

2004-08-18

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 8.8% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 95% of all scored CVEs.

Check your external exposure to CVE-2004-0375

Confirm whether Symantec Client Firewall is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2004-0375.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2004-0375

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2004-0375 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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