How severe is CVE-2004-0375?

CVE-2004-0375 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2004-0375 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0375?

CVE-2004-0375 primarily affects Symantec Client Firewall. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-0375?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2004-0375 published?

CVE-2004-0375 was published on 2004-08-18 and last updated on 2026-06-16.

CVE-2004-0375

CVE-2004-0375 is a medium-severity vulnerability in Symantec Client Firewall with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Symantec Client Firewall
Published: 2004-08-18
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2004-0375?: 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.
How severe is CVE-2004-0375?: CVE-2004-0375 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2004-0375 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0375?: CVE-2004-0375 primarily affects Symantec Client Firewall. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-0375?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2004-0375 published?: CVE-2004-0375 was published on 2004-08-18 and last updated on 2026-06-16.

References

Affected products (10)

cpe:2.3:a:symantec:client_firewall:5.01:*:*:*:*:*:*:*
cpe:2.3:a:symantec:client_firewall:5.1.1:*:*:*:*:*:*:*
cpe:2.3:a:symantec:client_security:1.0:*:*:*:*:*:*:*
cpe:2.3:a:symantec:client_security:1.1:*:*:*:*:*:*:*
cpe:2.3:a:symantec:norton_internet_security:2003:*:*:*:*:*:*:*
cpe:2.3:a:symantec:norton_internet_security:2003:*:pro:*:*:*:*:*
cpe:2.3:a:symantec:norton_internet_security:2004:*:*:*:*:*:*:*
cpe:2.3:a:symantec:norton_internet_security:2004:*:pro:*:*:*:*:*
cpe:2.3:a:symantec:norton_personal_firewall:2003:*:*:*:*:*:*:*
cpe:2.3:a:symantec:norton_personal_firewall:2004:*:*:*:*:*:*:*

More vulnerabilities in Symantec Client Firewall

CVE-2004-0444 — Critical (CVSS 10.0): Multiple vulnerabilities in SYMDNS.SYS for Symantec Norton Internet Security and Professional 2002 through 2004, Norton…
CVE-2004-0445 — Low (CVSS 2.6): The SYMDNS.SYS driver in Symantec Norton Internet Security and Professional 2002 through 2004, Norton Personal Firewall…

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