CVE-2008-0027
CriticalHeap-based buffer overflow in the Certificate Trust List (CTL) Provider service (CTLProvider.exe) in Cisco Unified Communications Manager (CUCM) 4.2 before 4.2(3)SR3 and 4.3 before 4.3(1)SR1, and CallManager 4.0 and 4.1 before 4.1(3)SR5c, allows remote attackers to cause a…
Published Jan 17, 2008 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2008-0027 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Unified Callmanager (Cisco), Unified Communications Manager (Cisco).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 57% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
10.0
AV:N/AC:L/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
57%
Higher than 99.0% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
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Description
Heap-based buffer overflow in the Certificate Trust List (CTL) Provider service (CTLProvider.exe) in Cisco Unified Communications Manager (CUCM) 4.2 before 4.2(3)SR3 and 4.3 before 4.3(1)SR1, and CallManager 4.0 and 4.1 before 4.1(3)SR5c, allows remote attackers to cause a denial of service or execute arbitrary code via a long request.
Affected Products
9 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Unified CallmanagerCisco | 4.0, 4.1, 4.1\(3\)sr4, 4.1\(3\)sr5, 4.1\(3\)sr5b | n/a |
| Unified Communications ManagerCisco | 4.2, 4.2.3sr2, 4.2.3sr2b, 4.3 | n/a |
Timeline
Publicly disclosed
Jan 17, 2008
Last updated
Apr 22, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
- patch20080116 Cisco Unified Communications Manager CTL Provider Heap Overflow
- otherhttp://dvlabs.tippingpoint.com/advisory/TPTI-08-02
- other28530
- other3551
- othercisco-cucm-ctl-bo(39704)
FAQ
Common Questions.
Heap-based buffer overflow in the Certificate Trust List (CTL) Provider service (CTLProvider.exe) in Cisco Unified Communications Manager (CUCM) 4.2 before 4.2(3)SR3 and 4.3 before 4.3(1)SR1, and CallManager 4.0 and 4.1 before 4.1(3)SR5c, allows remote attackers to cause a denial of service or execute arbitrary code v…
Affected: Unified Callmanager (Cisco) versions 4.0, 4.1, 4.1\(3\)sr4, 4.1\(3\)sr5, 4.1\(3\)sr5b; Unified Communications Manager (Cisco) versions 4.2, 4.2.3sr2, 4.2.3sr2b, 4.3. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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