CVE-2008-2551Instant Messenger Vulnerability
The DownloaderActiveX Control (DownloaderActiveX.ocx) in Icona SpA C6 Messenger 1.0.0.1 allows remote attackers to force the download and execution of arbitrary files via a URL in the propDownloadUrl parameter with the propPostDownloadAction parameter set to "run."
Published Jun 4, 2008 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2008-2551 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Instant Messenger (Icona).
- It is exploited in the wild, listed in Industry KEV feed since Aug 17, 2021. Public exploit code is available.
- EPSS estimates a 47% 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 listed as exploited in the wild.
Scores
CVSS v2
9.3
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
47%
Higher than 98.8% of all scored CVEs
Exploit maturity
Weaponized
ATLAS score
57/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Aug 17, 2021
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Weaponized
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
- advisory30512
Description
The DownloaderActiveX Control (DownloaderActiveX.ocx) in Icona SpA C6 Messenger 1.0.0.1 allows remote attackers to force the download and execution of arbitrary files via a URL in the propDownloadUrl parameter with the propPostDownloadAction parameter set to "run."
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Aug 17, 2021 | n/a | Not reported |
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Instant MessengerIcona | 1.0.0.1 | n/a |
Timeline
Publicly disclosed
Jun 4, 2008
Added to Industry KEV feed
Aug 17, 2021
Last updated
Apr 22, 2026
Weakness Type
- CWE-264
References
- advisory30512
- exploitVulnCheck exploitation report
- exploitMSF c6_messenger_downloaderactivex.rb
- exploitExploitDB-18449
- other3926
FAQ
Common Questions.
The DownloaderActiveX Control (DownloaderActiveX.ocx) in Icona SpA C6 Messenger 1.0.0.1 allows remote attackers to force the download and execution of arbitrary files via a URL in the propDownloadUrl parameter with the propPostDownloadAction parameter set to "run."
Affected: Instant Messenger (Icona) versions 1.0.0.1. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Aug 17, 2021.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2008-2551 On Your Attack Surface?
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