VulnerabilityPublished 15 Dec 2024Updated 16 Dec 2024

CVE-2024-55969: syncfusion.essentialstudio.aspnetmvc.docio

Affects syncfusion.essentialstudio.aspnetmvc.docioSource CVE Database V5

Not known to be exploited · CVSS 9.1 Critical : upgrade to 27.1.55 as a priority.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score

9.1Critical

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.
Patch: Available – fixed in 27.1.55

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
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: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
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 15 Dec 2024
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

Upgrade syncfusion.essentialstudio.aspnetmvc.docio to 27.1.55.

Affected software

Product	Affected	Fixed in
NuGetsyncfusion.essentialstudio.aspnetmvc.docio`pkg:nuget/syncfusion.essentialstudio.aspnetmvc.docio`Other threats	Affected <27.1.55	Fixed in 27.1.55

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade immediately to Syncfusion Essential Studio for ASP.NET MVC version 27.1.55 or later, where this vulnerability is fixed.
Implement strict input validation and sanitization for all DOCX files and external XML references before processing to prevent malformed or malicious XML content from triggering exceptions.
Employ web application firewalls (WAFs) with custom rules to detect and block suspicious DOCX file uploads or requests containing external XML references.
Monitor application logs and error reports for XMLException occurrences or abnormal crashes related to document processing.
Isolate document processing services to minimize impact on other critical systems in case of denial of service.
Conduct regular security assessments and code reviews focusing on XML parsing and external reference handling.
Educate developers and administrators about secure handling of external XML data and the risks of untrusted document content.
If immediate upgrade is not feasible, consider disabling or restricting features that allow external XML references in DOCX documents as a temporary workaround.

Description

DocIO in Syncfusion Essential Studio for ASP.NET MVC before 27.1.55 throws XMLException during the resaving of a DOCX document with an external reference XML, aka I640714.

Impact

The vulnerability can lead to significant operational disruption for organizations using affected versions of Syncfusion Essential Studio for ASP.NET MVC. Exploitation can cause application crashes or denial of service, impacting availability of document processing services. The high confidentiality impact suggests that sensitive document contents or metadata might be exposed or improperly handled during the XML parsing failure. This can result in data leakage or unauthorized information disclosure. Since no authentication or user interaction is required, attackers can remotely exploit this flaw at scale, potentially targeting public-facing web applications that process DOCX files. This can affect business continuity, customer trust, and compliance with data protection regulations. Organizations relying on automated document workflows or document generation in ASP.NET MVC environments are particularly vulnerable. The absence of known exploits in the wild provides a window for proactive mitigation, but the critical severity demands immediate attention to prevent future attacks.

References

ej2.syncfusion.com/aspnetmvc/documentation/release-notes/27.1.55?type=all (opens in a new tab)

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