Is CVE-2026-45771 in the CISA KEV catalog?

No. CVE-2026-45771 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-45771?

CVE-2026-45771 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2026-45771?

CVE-2026-45771 has an EPSS score of 0.34% (27th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-45771?

Upgrade freeswitch to 1.11.0 or later.

CVE & CISA-KEV Catalog

CVE-2026-45771

HIGH

7.5

CVSS v3

NVD

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.

CWE-776

How to fix

Remediation Available

freeswitchNVD

Affected:< 1.11.0Fixed in:1.11.0CVE-2026-45771derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.34%probability of exploitation in 30 days

27thpercentile

Low risk: more likely to be exploited than 27% of all known CVEs.

References

Vendor Advisory1

github.com

Release Notes1

github.com

Related Vulnerabilities

Other CWE-776 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-1955	High	7.5	53%	-	Fix
CVE-2017-18640	High	7.5	27%	-	Fix
CVE-2019-11253	High	7.5	26%	-	Fix
CVE-2019-12401	High	7.5	7.5%	-	-
CVE-2023-20052	Medium	5.3	7.0%	-	Fix
CVE-2019-15903	High	7.5	6.7%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-20.