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No exploitation reportedFix available

CVE-2020-3305

No exploitation reported by the sources we read.

  • Published2020-05-06
  • Fixed in9.12.2.9 · 9.10.1.30 · 9.8.4.10
  • WeaknessCWE-400

Am I 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

A vulnerability in the implementation of the Border Gateway Protocol (BGP) module in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of certain BGP packets. An attacker could exploit this vulnerability by sending a crafted BGP packet. A successful exploit could allow the attacker to cause a DoS condition on the affected device.

Timeline

dates in UTC
  1. 2020-05-0617:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-3305?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-3305?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Cisco ASAversion to verify
BranchAffectedFixed in
9.12≥ 9.12, < 9.12.2.99.12.2.9
9.x≥ 9.9, < 9.10.1.309.10.1.30
9.x≥ 9.7, < 9.8.4.109.8.4.10
Cisco secure firewall threat defense
BranchAffectedFixed in
6.4≥ 6.4.0, < 6.4.0.66.4.0.6
6.3< 6.3.0.56.3.0.5
Cisco adaptive security applianceversion to verify
BranchAffectedFixed in
9.6< 9.6.4.369.6.4.36

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Cisco ASA to 9.12.2.9 · 9.10.1.30 · 9.8.4.10

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2024-11-15
  • OpenCVESSVC decisionnone—
  • NVDCVSS 3.17.5read 2026-10-23
  • CNACVSS 3.06.8read 2026-10-23
  • NVDCVSS 2.07.8read 2026-10-23
  • CNAweakness (CWE)CWE-400read 2026-10-23
  • NVDweakness (CWE)CWE-400read 2026-10-23
  • FIRST EPSSEPSS score1.2 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2020-05-06
Last Modified
2026-08-11
NVD status
Modified

Frequently asked questions

What is CVE-2020-3305?

A vulnerability in the implementation of the Border Gateway Protocol (BGP) module in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of certain BGP packets. An attacker could exploit this vulnerability by sending a crafted BGP packet. A successful exploit could allow the attacker to cause a DoS condition on the affected device.

Is CVE-2020-3305 actively exploited?

Active exploitation of CVE-2020-3305 has not been confirmed. Its EPSS score was 1.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-3305?

CVE-2020-3305 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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