Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.x, 5.x before 5.1(3g), 6.x before 6.1(4), 7.0 before 7.0(2), and 7.1 before 7.1(2); and Cisco Unified Presence 1.x, 6.x before 6.0(6), and 7.x before 7.0(4); allows remote attackers to cause a denial of service (TCP services outage) via a large number of TCP connections, related to "tracking of network connections," aka Bug IDs CSCsq22534 and CSCsw52371
Published Aug 27, 2009
7.8
HIGHCVSS 2.0
EPSS 3.98%
Description
Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.x, 5.x before 5.1(3g), 6.x before 6.1(4), 7.0 before 7.0(2), and 7.1 before 7.1(2); and Cisco Unified Presence 1.x, 6.x before 6.0(6), and 7.x before 7.0(4); allows remote attackers to cause a denial of service (TCP services outage) via a large number of TCP connections, related to "tracking of network connections," aka Bug IDs CSCsq22534 and CSCsw52371.
Affected products
No data.
- ≥ 5.0 · < 5.1\(3g\)
- ≥ 6.1\(1\) · < 6.1\(4\)
- ≥ 7.0 · < 7.0\(2\)
- ≥ 7.1 · < 7.1\(2\)
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 3.98% (0.03975) | 90.17th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.98% (0.03975) | 89.10th | v5 (v2026.06.15) |
| Mar 17, 2025 | 2.76% (0.02760) | 85.05th | v4 (v2025.03.14) |
| Dec 17, 2024 | 4.03% (0.04033) | 91.98th | v3 (v2023.03.01) |
| May 23, 2024 | 1.69% (0.01687) | 87.72th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.69% (0.01687) | 85.72th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
No CWE recorded.
References (10)
- http://secunia.com/advisories/36498 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/36499 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/37039 third-party-advisoryx_refsource_SECUNIAThird Party Advisory
- http://securitytracker.com/id?1023018 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- http://www.cisco.com/en/US/products/products_security_advisory09186a0080af2d11.shtml vendor-advisoryx_refsource_CISCOPatchVendor Advisory
- http://www.cisco.com/en/US/products/products_security_advisory09186a0080afc930.shtml vendor-advisoryx_refsource_CISCOVendor Advisory
- http://www.securityfocus.com/bid/36152 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/36676 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id?1022775 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- http://www.vupen.com/english/advisories/2009/2915 vdb-entryx_refsource_VUPENThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://secunia.com/advisories/36498 | third-party-advisoryx_refsource_SECUNIAVendor Advisory | |
| http://secunia.com/advisories/36499 | third-party-advisoryx_refsource_SECUNIAVendor Advisory | |
| http://secunia.com/advisories/37039 | third-party-advisoryx_refsource_SECUNIAThird Party Advisory | |
| http://securitytracker.com/id?1023018 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| http://www.cisco.com/en/US/products/products_security_advisory09186a0080af2d11.shtml | vendor-advisoryx_refsource_CISCOPatchVendor Advisory | |
| http://www.cisco.com/en/US/products/products_security_advisory09186a0080afc930.shtml | vendor-advisoryx_refsource_CISCOVendor Advisory | |
| http://www.securityfocus.com/bid/36152 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securityfocus.com/bid/36676 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id?1022775 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| http://www.vupen.com/english/advisories/2009/2915 | vdb-entryx_refsource_VUPENThird Party Advisory |
Change history (0)
No recorded changes yet.