CVE-2009-2055
Exploitation confirmed. First attested on 2022-03-25 by CISA-ADP, CISA KEV, GCVE · kevintel.
- Published2009-08-19
- WeaknessCWE-20
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset) via a BGP UPDATE message with an invalid attribute, as demonstrated in the wild on 17 August 2009.
Timeline
dates in UTCObserved activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2009-2055?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2009-2055?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 3.4 | = 3.4 | no fix published | NVD |
| 3.4 | = 3.4.0 | no fix published | NVD |
| 3.4 | = 3.4.1 | no fix published | NVD |
| 3.4 | = 3.4.2 | no fix published | NVD |
| 3.4 | = 3.4.3 | no fix published | NVD |
| 3.5 | = 3.5 | no fix published | NVD |
| 3.5 | = 3.5.2 | no fix published | NVD |
| 3.5 | = 3.5.3 | no fix published | NVD |
| 3.5 | = 3.5.4 | no fix published | NVD |
| 3.6 | = 3.6.0 | no fix published | NVD |
| 3.6 | = 3.6.1 | no fix published | NVD |
| 3.6 | = 3.6.2 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- CISA’s required action: Apply updates per vendor instructions.due 2022-04-15
Advisories and patches
- www.cisco.comPatch · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
CISA Known Exploited Vulnerability
- Date Added
- 2022-03-25
- Patch Due Date
- 2022-04-15
- Ransomware Use
- Unknown
- Required Action
- Apply updates per vendor instructions.
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2009-08-19
- Last Modified
- 2026-06-16
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2009-2055?
Is CVE-2009-2055 actively exploited?
What is the CVSS score for CVE-2009-2055?
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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.