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CVE-2021-36513

24
FAUCET Score

CVE-2021-36513 is a high-severity vulnerability affecting SignalWire FreeSWITCH versions prior to 1.10.6. It stems from an uninitialized value in the sofia_handle_sip_i_notify function within sofia.c, potentially allowing unauthenticated attackers to remotely view sensitive information. While the CVSS score is 7.5 (High), indicating a significant risk for confidentiality, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.10.6CPE matchmatch criteria
cpe:2.3:a:signalwire:freeswitch:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.81%
Probability of exploitation in next 30 days
EPSS Percentile
76.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0181 is in the 59th percentile among its peer group of 51,551 CVEs.

Social Chatter

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

Remediation records are not available for this CVE.

References

github.com / signalwire/freeswitch/issues/1245
ExploitThird Party Advisory
github.com / signalwire/freeswitch/releases/tag/v1.10.6
Release NotesThird Party Advisory
newreleases.io / project/github/signalwire/freeswitch/release/v1.10.6
Release NotesThird Party Advisory