CVE-2025-12863VulnerabilityPublished 7 Nov 2025Updated 20 Nov 2025

CVE-2025-12863: Red Hat Enterprise Linux 10

Affects Red Hat Enterprise Linux 10Source CVE Database V5

Not known to be exploited · CVSS 7.5 High.

Data as of 27 Nov 2025, 12:17 UTC

CVSS 3.1 base score

7.5High

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

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 7 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 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

AI-suggested

1. Monitor system logs and network traffic for unusual crashes or service interruptions that may indicate exploitation attempts. 2. Implement network-level protections such as firewalls and intrusion detection/prevention systems to limit exposure of Red Hat Enterprise Linux 10 systems to untrusted networks. 3. Restrict access to critical systems by using network segmentation and VPNs to reduce the attack surface. 4. Stay informed through Red Hat security advisories and apply patches promptly once they are released. 5. Conduct regular backups and ensure disaster recovery plans are tested to minimize downtime impact. 6. Employ rate limiting and connection throttling on network services to mitigate potential DoS attempts. 7. Use vulnerability scanning tools to identify systems running vulnerable versions and prioritize remediation. 8. Engage with Red Hat support for guidance and potential workarounds until official patches are available.

Impact

The primary impact of CVE-2025-12863 is a denial of service condition that can disrupt availability of systems running Red Hat Enterprise Linux 10. For European organizations, this could translate into downtime for critical services, loss of productivity, and potential financial losses. Sectors such as finance, healthcare, telecommunications, and government services that rely heavily on Red Hat Enterprise Linux for their server infrastructure may experience operational interruptions. The vulnerability's remote exploitability without authentication increases the risk of widespread attacks, potentially affecting cloud service providers and data centers hosting European customers. While confidentiality and integrity are not impacted, the availability loss could lead to cascading effects, including delayed services and damage to organizational reputation. The absence of known exploits currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once more technical details or patches are released.

Summary

CVE-2025-12863 is a vulnerability identified in Red Hat Enterprise Linux 10, disclosed on November 7, 2025. The vulnerability allows a remote attacker to cause a denial of service (DoS) without requiring any authentication or user interaction. According to the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), the attack can be launched over the network with low complexity, no privileges, and no user interaction, resulting in a complete loss of availability. The vulnerability does not affect confidentiality or integrity, focusing solely on availability disruption. No detailed technical information, affected versions, or patches have been published yet, and there are no known exploits in the wild. The lack of patches and technical details suggests that organizations should be vigilant and prepare for mitigation once more information becomes available. The vulnerability's impact is significant for environments where uptime and service availability are critical, such as enterprise servers and cloud infrastructure running Red Hat Enterprise Linux 10. The absence of user interaction and privileges required makes this vulnerability particularly dangerous as it can be exploited by any remote attacker scanning for vulnerable systems. The vulnerability's state is published, indicating that it is recognized and tracked officially by Red Hat and the CVE database.

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Exploitation evidence

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AI analysisMachine-generated, updated 21 Nov 2025, 22:32 UTC

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