How severe is CVE-2008-4543?

CVE-2008-4543 has a CVSS 2.0 base score of 7.1, rated high severity.

Is CVE-2008-4543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-4543?

CVE-2008-4543 primarily affects Cisco Unity. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-4543?

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-2008-4543 published?

CVE-2008-4543 was published on 2008-10-13 and last updated on 2026-06-16.

CVE-2008-4543

CVE-2008-4543 is a high-severity vulnerability in Cisco Unity with a CVSS 2.0 base score of 7.1. 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 7.1)
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Unity
Published: 2008-10-13
Last modified: 2026-06-16

Description

Cisco Unity 4.x before 4.2(1)ES161, 5.x before 5.0(1)ES53, and 7.x before 7.0(2)ES8, when using anonymous authentication (aka native Unity authentication), allows remote attackers to cause a denial of service (session exhaustion) via a large number of connections.

Frequently asked questions

What is CVE-2008-4543?: Cisco Unity 4.x before 4.2(1)ES161, 5.x before 5.0(1)ES53, and 7.x before 7.0(2)ES8, when using anonymous authentication (aka native Unity authentication), allows remote attackers to cause a denial of service (session exhaustion) via a large number of connections.
How severe is CVE-2008-4543?: CVE-2008-4543 has a CVSS 2.0 base score of 7.1, rated high severity.
Is CVE-2008-4543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-4543?: CVE-2008-4543 primarily affects Cisco Unity. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-4543?: 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-2008-4543 published?: CVE-2008-4543 was published on 2008-10-13 and last updated on 2026-06-16.

References

Affected products (12)

cpe:2.3:a:cisco:unity:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:4.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:4.0\(1\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:4.0\(2\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:4.0\(3\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:4.0\(3\):sr2:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:4.0\(4\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:4.0\(4\):sr1:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:4.0\(5\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:4.1\(1\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:5.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity:7.0:*:*:*:*:*:*:*

More vulnerabilities in Cisco Unity

CVE-2008-3814 — Medium (CVSS 5.8): Unspecified vulnerability in Cisco Unity 4.x before 4.2(1)ES161, 5.x before 5.0(1)ES53, and 7.x before 7.0(2)ES8, when…
CVE-2008-4544 — Medium (CVSS 5.0): Unspecified vulnerability in an unspecified Microsoft API, as used by Cisco Unity and possibly other products, allows…
CVE-2008-4545 — Medium (CVSS 4.0): Cisco Unity 4.x before 4.2(1)ES161, 5.x before 5.0(1)ES53, and 7.x before 7.0(2)ES8 uses weak permissions for the…
CVE-2008-4542 — Low (CVSS 3.5): Cross-site scripting (XSS) vulnerability in Cisco Unity 4.x before 4.2(1)ES162, 5.x before 5.0(1)ES56, and 7.x before…

All CVEs affecting Cisco Unity →

Other CWE-399 (Resource Management Errors) vulnerabilities

CVE-2015-8104 — Critical (CVSS 10.0): The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a…
CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

Browse all CWE-399 (Resource Management Errors) vulnerabilities →