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CVE-2018-15439

71
FAUCET Score

CVE-2018-15439 is a critical vulnerability affecting Cisco Small Business Switches, allowing an unauthenticated, remote attacker to bypass authentication due to a hidden, privileged user account. With a CVSS score of 9.8, this flaw enables full administrative control over affected devices, posing a severe risk to confidentiality, integrity, and availability. While Cisco has not released a patch, a workaround exists, and exploit code is available via Metasploit, indicating a high potential for exploitation, further evidenced by significant community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:cisco:sg200-50_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:cisco:sg200-50p_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:cisco:sg200-50fp_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:cisco:sg200-26_firmware:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:cisco:sg200-26p_firmware:-:*:*:*:*:*:*:*

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
49.74%
Probability of exploitation in next 30 days
EPSS Percentile
98.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Metasploit: Cisco Prime Infrastructure Runrshell Privilege Escalation · Dec 8, 2018
This CVE's current EPSS score of 0.4974 is in the 96th percentile among its peer group of 36,897 CVEs.

Social Chatter

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

The average CVE in this peer group has 0.3 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-20181107-sbsw-privacc
Vendor Advisory
securityfocus.com / bid/105873
Third Party AdvisoryVDB Entry