CVE-2023-5157VulnerabilityPublished 26 Sep 2023Updated 8 Nov 2025

CVE-2023-5157: Red Hat Enterprise Linux 8 · Uncontrolled Resource Consumption

Affects Red Hat Enterprise Linux 8Source 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: 2.2% chance of exploitation in 30 days – higher than 82% 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 26 Sep 2023
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. Restrict network access to MariaDB ports (3306 and 4567) using firewalls or network access control lists (ACLs) to allow only trusted hosts or internal networks. 2. Implement intrusion detection/prevention systems (IDS/IPS) to detect and block suspicious scanning activity, especially OpenVAS or similar port scans targeting database ports. 3. Disable unnecessary services or ports if MariaDB is not required to listen on port 4567 or if clustering features using this port are not in use. 4. Regularly monitor logs and network traffic for unusual patterns indicative of scanning or resource exhaustion attempts. 5. Apply any vendor-provided patches or updates as soon as they become available from Red Hat or MariaDB. 6. Consider deploying rate limiting or connection throttling on database ports to mitigate resource exhaustion from repeated connection attempts. 7. Segment database servers within internal networks to minimize exposure to external threats. 8. Conduct regular security assessments and penetration tests to identify and remediate exposure of critical services.

Description

A vulnerability was found in MariaDB. An OpenVAS port scan on ports 3306 and 4567 allows a malicious remote client to cause a denial of service.

Impact

For European organizations, this vulnerability poses a significant risk to the availability of database services running MariaDB on Red Hat Enterprise Linux 8. Denial of service attacks can disrupt business operations, especially for sectors relying heavily on database availability such as finance, healthcare, telecommunications, and public services. The ease of exploitation without authentication means attackers can launch attacks remotely with minimal effort, potentially causing widespread service outages. This can lead to operational downtime, loss of customer trust, and financial losses. Additionally, critical infrastructure providers using these systems may face increased risk of service disruption, which could have cascading effects on dependent services. The lack of confidentiality or integrity impact reduces the risk of data breaches but does not diminish the operational threat posed by service unavailability. Organizations with exposed MariaDB ports on the internet are particularly vulnerable, emphasizing the need for immediate mitigation.

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 8 Nov 2025, 04:13 UTC

Technical details

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