CVE-2024-45539VulnerabilityPublished 4 Dec 2025

CVE-2024-45539: Synology DiskStation Manager (DSM) · Out-of-bounds Write

Affects Synology DiskStation Manager (DSM)Source CVE Database V5

Not known to be exploited · CVSS 7.5 High.

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: 0.4% chance of exploitation in 30 days – higher than 41% 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 4 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
Synology DiskStation Manager (DSM)	Affected =7.2.2 =7.2.1	Fixed in–

AI-suggested

Organizations should immediately identify all Synology NAS devices and Unified Controllers running affected DSM versions (prior to 7.2.1-69057-2 and 7.2.2-72806 for DSM, and prior to 3.1.4-23079 for DSMUC). They must apply the official patches or upgrade to the fixed versions as soon as they become available from Synology. Until patches are applied, restrict network access to management interfaces by implementing firewall rules that limit access to trusted IP addresses and internal networks only. Disable or restrict CGI services if possible, or apply web application firewall (WAF) rules to detect and block suspicious CGI requests that could trigger out-of-bounds writes. Monitor NAS device logs and network traffic for unusual crashes or restarts indicative of exploitation attempts. Conduct vulnerability scanning and penetration testing focused on DSM CGI components to identify exposure. Establish incident response plans for NAS service outages and ensure backups are current and tested for recovery. Engage with Synology support for guidance and stay updated on advisories. For critical environments, consider network segmentation and isolation of NAS devices to reduce exposure.

Description

Out-of-bounds write vulnerability in cgi components in Synology DiskStation Manager (DSM) before 7.2.1-69057-2 and 7.2.2-72806 and Synology Unified Controller (DSMUC) before 3.1.4-23079 allows remote attackers to conduct denial-of-service attacks via unspecified vectors.

Impact

For European organizations, the primary impact is denial of service on Synology NAS devices running vulnerable DSM versions. This can lead to unavailability of critical data storage, backup services, and unified device management functions, disrupting business continuity. Industries relying heavily on NAS for file sharing, archival, or virtualization storage—such as finance, healthcare, manufacturing, and public sector—may experience operational downtime. The lack of confidentiality or integrity impact reduces risk of data breach but does not eliminate operational risk. The vulnerability’s network accessibility and no authentication requirement increase the attack surface, potentially allowing remote attackers to disrupt services without insider access. Given the widespread use of Synology products in Europe, especially in SMBs and some enterprise environments, the risk of targeted or opportunistic DoS attacks is significant. Organizations with NAS devices exposed to the internet or poorly segmented internal networks are particularly vulnerable. The absence of known exploits in the wild currently lowers immediate risk but does not preclude future exploitation. The impact is compounded in environments lacking robust monitoring or incident response capabilities.

References

synology.com/en-global/security/advisory/Synology_SA_24_27 (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Dec 2025, 14:45 UTC

Technical details

References

Community reviews

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