No exploitation reported

CVE-2020-3283

No exploitation reported by the sources we read.

Published2020-05-06
WeaknessCWE-119 · CWE-787

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 Secure Sockets Layer (SSL)/Transport Layer Security (TLS) handler of Cisco Firepower Threat Defense (FTD) Software when running on the Cisco Firepower 1000 Series platform could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition on an affected device. The vulnerability is due to a communication error between internal functions. An attacker could exploit this vulnerability by sending a crafted SSL/TLS message to an affected device. A successful exploit could allow the attacker to cause a buffer underrun, which leads to a crash. The crash causes the affected device to reload.

Timeline

dates in UTC

2020-05-0617:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2020-3283?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-3283?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco asa 5505 firmwareversion to verify

Branch	Affected	Fixed in	Source
9.12	= 9.12\(2.12\)	no fix published	NVD
9.13	= 9.13\(0.33\)	no fix published	NVD

Cisco asa 5510 firmwareversion to verify

Branch	Affected	Fixed in	Source
9.12	= 9.12\(2.12\)	no fix published	NVD
9.13	= 9.13\(0.33\)	no fix published	NVD

Cisco asa 5512-x firmwareversion to verify

Branch	Affected	Fixed in	Source
9.12	= 9.12\(2.12\)	no fix published	NVD
9.13	= 9.13\(0.33\)	no fix published	NVD

10 more products in the sources.

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

Fix

Advisories and patches

tools.cisco.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2024-11-15
OpenCVESSVC decisionnone—
NVDCVSS 3.18.6read 2026-10-23
CNACVSS 3.08.6read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-119read 2026-10-23
NVDweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score2.0 %2026-10-23

Technical details

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

Frequently asked questions

What is CVE-2020-3283?

Is CVE-2020-3283 actively exploited?

Active exploitation of CVE-2020-3283 has not been confirmed. Its EPSS score was 2.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-3283?

CVE-2020-3283 has a CVSS v3 base score of 8.6 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

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