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CVE-2020-3258

25
FAUCET Score

CVE-2020-3258 describes multiple critical vulnerabilities in Cisco IOS Software affecting Cisco 809/829 Industrial Integrated Services Routers and Cisco 1000 Series Connected Grid Routers. These flaws allow an unauthenticated, remote attacker or an authenticated, local attacker to execute arbitrary code or cause a system crash and reload. With a CVSS score of 9.8, this vulnerability is critical, requiring no user interaction or complex attack vectors, and can lead to complete compromise of confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
15.8\(3\)m2CPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.8\(3\)m2:*:*:*:*:*:*:*
15.8\(9\)CPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.8\(9\):*:*:*:*:*:*:*
15.9CPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.9:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.65%
Probability of exploitation in next 30 days
EPSS Percentile
90.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0465 is in the 84th percentile among its peer group of 36,833 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

ciscopatch availablevia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-iot-rce-xYRSeMNH
PatchVendor Advisory