CVE-2007-1673

CVE-2007-1673 is a high-severity vulnerability in Amavis with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

• Severity: High (CVSS 2.0 base score 7.8)
• EPSS exploit prediction: 3% (87th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-399
• Affected product: Amavis
• Published: 2007-05-09
• Last modified: 2026-06-16

Description

unzoo.c, as used in multiple products including AMaViS 2.4.1 and earlier, allows remote attackers to cause a denial of service (infinite loop) via a ZOO archive with a direntry structure that points to a previous file.

Frequently asked questions

What is CVE-2007-1673?

unzoo.c, as used in multiple products including AMaViS 2.4.1 and earlier, allows remote attackers to cause a denial of service (infinite loop) via a ZOO archive with a direntry structure that points to a previous file.

How severe is CVE-2007-1673?

CVE-2007-1673 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2007-1673 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-1673?

CVE-2007-1673 primarily affects Amavis. In total, 58 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-1673?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2007-1673 published?

CVE-2007-1673 was published on 2007-05-09 and last updated on 2026-06-16.

References

• http://osvdb.org/36208
• http://secunia.com/advisories/25315
• http://securityreason.com/securityalert/2680
• http://www.amavis.org/security/asa-2007-2.txt
• http://www.securityfocus.com/archive/1/467646/100/0/threaded
• http://www.securityfocus.com/bid/23823
• https://exchange.xforce.ibmcloud.com/vulnerabilities/34080

Affected products (58)

• cpe:2.3:a:amavis:amavis:*:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus:*:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus:4.6.394:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus:4.7.652:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus:4.7.700:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.0:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.6:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.6.652:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.6.655:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.6.665:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.6.691:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.7.827:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.7.827:*:windows:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.7.844:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.7.844:*:windows:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.7.869:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.7.869:*:windows:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.7.1043:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.7.1043:*:windows:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.7.1098:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_home:4.7.1098:*:windows:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.0:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.6:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.6.603:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.6.652:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.6.665:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.6.691:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.7.827:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.7.827:*:windows:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.7.844:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.7.844:*:windows:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.7.869:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.7.1043:*:*:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.7.1043:*:windows:*:*:*:*:*
• cpe:2.3:a:avast:avast_antivirus_professional:4.7.1098:*:*:*:*:*:*:*
• cpe:2.3:a:avira:antivir:*:*:*:*:*:*:*:*
• cpe:2.3:a:avira:antivir:6.35.00.00:*:*:*:*:*:*:*
• cpe:2.3:a:avira:antivir:7.04.00.23:*:*:*:*:*:*:*
• cpe:2.3:a:avira:antivir_personal:*:*:*:*:*:*:*:*
• cpe:2.3:a:avira:antivir_personal:*:*:classic:*:*:*:*:*

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