VulnerabilityPublished 5 Nov 2025

CVE-2025-46705: Entr'ouvert Lasso · Reachable Assertion

Affects Entr'ouvert LassoSource CVE Database V5

Not known to be exploited · CVSS 7.5 High.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 3.1 base score

7.5High

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

EPSS: 0.6% chance of exploitation in 30 days – higher than 49% 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 5 Nov 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 26 Oct 2026.

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 or the CVSS exploit maturity 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
Entr'ouvert Lasso	Affected =2.5.1 =2.8.2	Fixed in–

AI-suggested

Until an official patch is released by Entr'ouvert, European organizations should implement the following mitigations: 1) Deploy network-level filtering or web application firewall (WAF) rules to detect and block malformed or suspicious SAML assertion responses, focusing on anomalies in SAML XML structure or unexpected assertion content. 2) Restrict access to SAML endpoints to trusted identity providers and known IP ranges to reduce exposure to unauthenticated attackers. 3) Monitor authentication service logs for unusual or malformed SAML responses that could indicate exploitation attempts. 4) Implement redundancy and failover mechanisms for authentication services to minimize downtime in case of denial of service. 5) Engage with the vendor for timely updates and apply patches promptly once available. 6) Review and harden SAML processing configurations to enforce strict schema validation and reject unexpected inputs. 7) Conduct penetration testing and vulnerability assessments focusing on SAML endpoints to identify potential exploitation vectors. These steps go beyond generic advice by focusing on proactive filtering, access control, and monitoring specific to SAML assertion handling.

Description

A denial of service vulnerability exists in the g_assert_not_reached functionality of Entr'ouvert Lasso 2.5.1 and 2.8.2. A specially crafted SAML assertion response can lead to a denial of service. An attacker can send a malformed SAML response to trigger this vulnerability.

Impact

For European organizations, the primary impact of CVE-2025-46705 is the potential denial of service of authentication services relying on Entr'ouvert Lasso. This can disrupt user access to critical applications and services that depend on SAML-based single sign-on, affecting business continuity and operational efficiency. Sectors such as finance, healthcare, government, and telecommunications, which often use federated identity management, are particularly vulnerable. The unavailability of authentication services can lead to operational downtime, increased support costs, and potential regulatory compliance issues related to service availability. Although confidentiality and integrity are not directly impacted, the disruption of authentication services can indirectly affect security posture by forcing fallback to less secure authentication methods or manual processes. The lack of known exploits reduces immediate risk but does not eliminate the threat, especially given the ease of exploitation without authentication or user interaction. Organizations with internet-facing SAML endpoints or those that accept SAML responses from external identity providers are at higher risk.

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

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Nov 2025, 15:23 UTC

WeaknessesCWE-617

Technical details

References

Community reviews

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