CVE-2025-66379VulnerabilityPublished 25 Dec 2025Updated 26 Dec 2025

CVE-2025-66379: Pexip Infinity · Reachable Assertion

Affects Pexip InfinitySource CVE Database V5

Not known to be exploited · CVSS 7.5 High · fixed in 39.0 : patch Pexip Infinity soon.

Data as of 26 Oct 2026, 06:26 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 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 39.0

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 2026-10-26.

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 =0	Fixed in–

AI-suggested

1. Upgrade to Pexip Infinity version 39.0 or later as soon as it becomes available, as this version addresses the improper input validation vulnerability. 2. Implement network-level filtering to restrict media streams to trusted sources only, using firewalls or session border controllers (SBCs) to limit exposure to untrusted or external networks. 3. Monitor network traffic for anomalous or malformed media streams that could indicate exploitation attempts. 4. Employ intrusion detection and prevention systems (IDS/IPS) with updated signatures to detect attempts to exploit this vulnerability. 5. Conduct regular security assessments and penetration testing focused on unified communication platforms to identify and remediate similar vulnerabilities. 6. Establish incident response procedures to quickly isolate and recover affected systems in case of a denial of service event. 7. Educate IT and security teams about the vulnerability and ensure timely application of vendor advisories and patches.

Description

CVE-2025-66379 is a high-severity vulnerability in Pexip Infinity versions before 39.0, caused by improper input validation in the media implementation. A remote attacker can send a specially crafted media stream to trigger a reachable assertion failure, causing the software to abort and resulting in a denial of service (DoS). The vulnerability requires no authentication or user interaction and can be exploited over the network. While it does not impact confidentiality or integrity, it severely affects availability. No known exploits are currently reported in the wild. European organizations using Pexip Infinity for video conferencing and collaboration services are at risk of service disruption. Mitigation involves promptly upgrading to version 39.0 or later once available and implementing network-level protections to restrict untrusted media streams. Countries with significant adoption of Pexip Infinity, such as the UK, Germany, France, and the Nordics, are most likely to be affected due to their extensive use of unified communications platforms.

Impact

For European organizations, the impact of CVE-2025-66379 can be substantial, particularly for those relying on Pexip Infinity for unified communications, remote collaboration, and video conferencing. A successful exploitation leads to denial of service, causing service interruptions that can halt critical communications, delay decision-making, and reduce productivity. This is especially critical for sectors such as finance, healthcare, government, and large enterprises where continuous availability of communication platforms is essential. The vulnerability does not expose sensitive data or allow unauthorized access, but the availability impact alone can cause operational and reputational damage. Additionally, in the context of increasing remote work and reliance on digital collaboration tools across Europe, disruption of such services can have cascading effects on business operations. The absence of known exploits in the wild currently reduces immediate risk, but the ease of exploitation and network accessibility mean attackers could develop exploits rapidly once the vulnerability is public knowledge.

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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