CVE-2025-66443VulnerabilityPublished 25 Dec 2025Updated 26 Dec 2025

CVE-2025-66443: Pexip Infinity · Reachable Assertion

Affects Pexip InfinitySource CVE Database V5

Not known to be exploited · CVSS 7.5 High.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Pexip Infinity	Affected =35.0	Fixed in–

AI-suggested

To mitigate CVE-2025-66443, organizations should promptly upgrade Pexip Infinity to version 39.0 or later, where the vulnerability has been addressed. If immediate upgrade is not feasible, review and consider disabling the non-default Direct Media configuration for WebRTC to prevent exposure to the vulnerable code path. Network-level protections such as firewall rules and intrusion detection/prevention systems should be configured to monitor and restrict suspicious signalling traffic to the Pexip Infinity servers. Implement strict access controls and network segmentation to limit exposure of the conferencing infrastructure to untrusted networks. Regularly monitor system logs and service health indicators for signs of crashes or abnormal terminations that may indicate exploitation attempts. Engage with Pexip support and subscribe to security advisories for updates on patches and recommended configurations. Additionally, conduct internal security assessments and penetration tests focusing on WebRTC signalling to identify potential weaknesses. Document and rehearse incident response procedures to quickly recover from potential denial of service incidents affecting communication services.

Description

CVE-2025-66443 is a high-severity vulnerability in Pexip Infinity versions 35.0 through 38.1 prior to 39.0, affecting non-default configurations that use Direct Media for WebRTC. It involves improper input validation in the signalling component, allowing an unauthenticated remote attacker to trigger a reachable assertion failure that causes the software to abort. This results in a temporary denial of service (DoS) condition. The vulnerability does not impact confidentiality or integrity but severely affects availability. Exploitation requires no user interaction and can be performed remotely over the network. No known exploits are currently reported in the wild. European organizations using Pexip Infinity for video conferencing with Direct Media enabled are at risk.

Impact

The primary impact of CVE-2025-66443 is a denial of service condition affecting the availability of Pexip Infinity video conferencing services. For European organizations, this can disrupt critical communication channels used for remote collaboration, virtual meetings, and secure conferencing, especially in sectors such as government, healthcare, finance, and large enterprises. Temporary service outages can lead to operational delays, reduced productivity, and potential reputational damage. Since the vulnerability can be exploited remotely without authentication, attackers can cause service interruptions at scale or target specific organizations. The lack of impact on confidentiality and integrity limits risks related to data breaches or manipulation, but availability disruptions in communication infrastructure can indirectly affect business continuity and incident response capabilities. Organizations using non-default Direct Media configurations are specifically at risk, which may include setups optimized for performance or compliance with certain network policies. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits following public disclosure.

CWE-617Reachable Assertion (opens in a new tab)
Base weakness
The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
Implementation
Make sensitive open/close operation non reachable by directly user-controlled data (e.g. open/close resources)
Implementation · Input Validation
Perform input validation on user data.
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

docs.pexip.com/admin/security_bulletins.htm (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 1 Jan 2026, 22:41 UTC

WeaknessesCWE-617

Technical details

References

Community reviews

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