CVE-2025-61785VulnerabilityPublished 8 Oct 2025

CVE-2025-61785: denoland deno · Incorrect Privilege Assignment

Affects denoland denoSource CVE Database V5

Not known to be exploited · CVSS 3.3 Low : upgrade to 2.2.15 when convenient.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.0 base score

3.3Low

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 2.2.15

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack Vector: Local
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
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: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Oct 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

Upgrade denoland deno to 2.2.15.

Affected software

Product	Affected	Fixed in
denoland deno	Affected <2.2.15	Fixed in 2.2.15

AI-suggested

1. Upgrade all Deno runtime environments to version 2.5.3 or later, or 2.2.15 or later, where the vulnerability is patched. 2. Audit existing scripts and applications that use Deno.FsFile.prototype.utime and utimeSync APIs to identify and remediate any unauthorized or unnecessary usage. 3. Implement strict code review and permission management policies to ensure scripts do not run with excessive privileges, especially avoiding unnecessary file system access. 4. Enhance monitoring and alerting on file metadata changes, correlating timestamp modifications with other system events to detect suspicious activity. 5. Use file integrity monitoring solutions that verify not only file contents but also metadata consistency to detect unauthorized timestamp changes. 6. Educate developers and DevOps teams about the importance of permission enforcement in Deno and encourage adoption of secure coding practices. 7. Consider isolating or sandboxing Deno runtime environments where possible to limit the scope of potential misuse. 8. Maintain an inventory of Deno versions deployed across the organization to ensure timely patching and vulnerability management.

Description

Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.utime` and `Deno.FsFile.prototype.utimeSync` are not limited by the permission model check `--deny-write=./`. It's possible to change to change the access (`atime`) and modification (`mtime`) times on the file stream resource even when the file is opened with `read` only permission (and `write`: `false`) and file write operations are not allowed (the script is executed with `--deny-write=./`). Similar APIs like `Deno.utime` and `Deno.utimeSync` require `allow-write` permission, however, when a file is opened, even with read only flags and deny-write permission, it's still possible to change the access (`atime`) and modification (`mtime`) times, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue.

Impact

For European organizations, the primary impact of CVE-2025-61785 lies in the potential manipulation of file metadata, specifically access and modification timestamps, without proper write permissions. This can undermine the integrity of file audit trails, compliance logs, and forensic investigations that rely on accurate timestamps to detect unauthorized changes or access patterns. Organizations using Deno in development, continuous integration pipelines, or production environments where file integrity and auditability are critical may face challenges in trustworthiness of file metadata. While the vulnerability does not permit direct modification of file content or deletion, altering timestamps could be leveraged in sophisticated attack scenarios to obfuscate malicious activity or evade detection. The low CVSS score and lack of known exploits suggest limited immediate risk, but the vulnerability could be exploited in targeted attacks where timestamp manipulation aids in stealth. European sectors with stringent compliance requirements, such as finance, healthcare, and government, may be particularly sensitive to such integrity issues. Additionally, organizations relying on automated monitoring tools that track file changes might experience false negatives or misinterpretations if timestamps are tampered with.

CWE-266Incorrect Privilege Assignment (opens in a new tab)
Base weaknessOWASP Top 10 A06:2025: Insecure Design (opens in a new tab)
A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.
Architecture and Design · Operation
Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
Architecture and Design · Operation · Environment Hardening
Run your code using the lowest privileges that are required to accomplish the necessary tasks. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment.
OWASP Cheat Sheets
Docker Security (opens in a new tab)
Third Party Javascript Management (opens in a new tab)
Virtual Patching (opens in a new tab)
Secure Design Principles (opens in a new tab)
OWASP ASVS 4.0.3
V1.4.4 (opens in a new tab)
V1.4.5 (opens in a new tab)
V1.10.1 (opens in a new tab)
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 8 Oct 2025, 01:15 UTC

WeaknessesCWE-266

Technical details

References

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