CVE-2007-2688

CVE-2007-2688 is a high-severity vulnerability in Cisco Ips Sensor Software 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.

Key facts

• Severity: High (CVSS 2.0 base score 7.8)
• EPSS exploit prediction: 3% (86th percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Cisco Ips Sensor Software
• Published: 2007-05-16
• Last modified: 2026-06-16

Description

The Cisco Intrusion Prevention System (IPS) and IOS with Firewall/IPS Feature Set do not properly handle certain full-width and half-width Unicode character encodings, which might allow remote attackers to evade detection of HTTP traffic.

Frequently asked questions

What is CVE-2007-2688?

The Cisco Intrusion Prevention System (IPS) and IOS with Firewall/IPS Feature Set do not properly handle certain full-width and half-width Unicode character encodings, which might allow remote attackers to evade detection of HTTP traffic.

How severe is CVE-2007-2688?

CVE-2007-2688 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2007-2688 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-2688?

CVE-2007-2688 primarily affects Cisco Ips Sensor Software. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-2688?

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-2007-2688 published?

CVE-2007-2688 was published on 2007-05-16 and last updated on 2026-06-16.

References

• http://secunia.com/advisories/25285
• http://www.cisco.com/en/US/products/products_security_response09186a008083f82e.html
• http://www.gamasec.net/english/gs07-01.html
• http://www.kb.cert.org/vuls/id/739224
• http://www.osvdb.org/35336
• http://www.securityfocus.com/archive/1/468633/100/0/threaded
• http://www.securityfocus.com/bid/23980
• http://www.securitytracker.com/id?1018053
• http://www.securitytracker.com/id?1018054
• http://www.vupen.com/english/advisories/2007/1803
• https://exchange.xforce.ibmcloud.com/vulnerabilities/34277
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5465

Affected products (23)

• cpe:2.3:a:cisco:ips_sensor_software:4.0:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:ips_sensor_software:5.0\(1\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:ips_sensor_software:5.0\(2\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:ips_sensor_software:5.0\(6\)p1:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:ips_sensor_software:5.1\(1\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:ips_sensor_software:5.1\(1a\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:ips_sensor_software:5.1\(1b\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:ips_sensor_software:5.1\(1c\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:ips_sensor_software:5.1\(1d\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:ips_sensor_software:5.1\(1e\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:ips_sensor_software:5.1\(p1\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:10.0:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:11.1cc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:11.3:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.0:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.0s:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.0st:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.0t:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1e:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1t:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2t:*:*:*:*:*:*:*

More vulnerabilities in Cisco Ips Sensor Software

• CVE-2014-0719 — High (CVSS 7.8): The control-plane access-list implementation in Cisco IPS Software before 7.1(8p2)E4 and 7.2 before 7.2(2)E4 allows…
• CVE-2006-4911 — High (CVSS 7.5): Unspecified vulnerability in Cisco IPS 5.0 before 5.0(6p2) and 5.1 before 5.1(2), when running in inline or promiscuous…
• CVE-2005-2681 — High (CVSS 7.2): Unspecified vulnerability in the command line processing (CLI) logic in Cisco Intrusion Prevention System 5.0(1) and…
• CVE-2015-0631 — High (CVSS 7.1): Race condition in the SSL implementation on Cisco Intrusion Prevention System (IPS) devices allows remote attackers to…
• CVE-2014-0720 — High (CVSS 7.1): Cisco IPS Software 7.1 before 7.1(8)E4 and 7.2 before 7.2(2)E4 allows remote attackers to cause a denial of service…
• CVE-2014-0718 — High (CVSS 7.1): The produce-verbose-alert feature in Cisco IPS Software 7.1 before 7.1(8)E4 and 7.2 before 7.2(2)E4 allows remote…

All CVEs affecting Cisco Ips Sensor Software →