CVE•Published 2026-06-09•Modified 2026-07-20•0 articles on news•4 live references•NVD data

CVE-2026-45771Freeswitch · Freeswitch

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 73% of all CVEs

Weaknesses (CWE)

CWE-776Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Description

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.0, FreeSWITCH's bundled XML parser expands nested <!ENTITY> declarations without a depth or count bound, so a small DTD can describe a body that expands exponentially ("billion laughs"). The PIDF body of a SIP PUBLISH is fed to this parser before any digest check, letting an unauthenticated network attacker force unbounded CPU and memory consumption with a single request. This issue has been patched in version 1.11.0.

Timeline

Published 2026-06-09

Modified 2026-07-20

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-45771

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Freeswitch Freeswitch"

All exposed Freeswitch Freeswitch instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Freeswitch"

HTTP body or banner mentions "Freeswitch" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-45771