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CVE-2018-6459

20
FAUCET Score

CVE-2018-6459 is a denial-of-service vulnerability affecting strongSwan 5.6.1, specifically within the rsa_pss_params_parse function. An unauthenticated remote attacker can trigger this by providing a malformed RSASSA-PSS signature lacking a mask generation function parameter. Rated as Medium severity (CVSS 5.3), this vulnerability is easily exploitable over the network with low attack complexity, leading to a denial of service. There is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or KEV listing, and it has garnered minimal community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
5.6.1CPE matchmatch criteria
cpe:2.3:a:strongswan:strongswan:5.6.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.07%
Probability of exploitation in next 30 days
EPSS Percentile
61.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0107 is in the 39th percentile among its peer group of 23,723 CVEs.

Social Chatter

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

Media Mentions

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

Remediation

Vendor Advisories (1)

redhatCVE-2018-6459Moderate

strongswan: Insufficient Input Validation in RSASSA-PSS Signature Parser

Feb 19, 2018

References

lists.opensuse.org / opensuse-security-announce/2020-03/msg00047.html
security.gentoo.org / glsa/201811-16
Third Party Advisory
strongswan.org / blog/2018/02/19/strongswan-vulnerability-%28cve-2018-6459%29.html