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CVE-2020-3255

20
FAUCET Score

CVE-2020-3255 describes a denial-of-service vulnerability in Cisco Firepower Threat Defense (FTD) Software. This flaw stems from inefficient memory management during packet processing, allowing an unauthenticated, remote attacker to cause a DoS by sending a high rate of specific IPv4 or IPv6 traffic. The vulnerability has a CVSS score of 7.5 (High), indicating it can be exploited over the network with low attack complexity, leading to high availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 6.2.3, < 6.2.3.16CPE matchmatch criteria
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
>= 6.3.0, < 6.3.0.6CPE matchmatch criteria
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
>= 6.4.0, < 6.4.0.9CPE matchmatch criteria
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
9.10\(1.3\)CPE matchmatch criteria
cpe:2.3:o:cisco:asa_5505_firmware:9.10\(1.3\):*:*:*:*:*:*:*
9.10\(1.3\)CPE matchmatch criteria
cpe:2.3:o:cisco:asa_5510_firmware:9.10\(1.3\):*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.80%
Probability of exploitation in next 30 days
EPSS Percentile
76.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0180 is in the 59th percentile among its peer group of 51,551 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-dos-N2vQZASR
Vendor Advisory