CVE-2023-51277VulnerabilityPublished 5 Jan 2024Updated 3 Jun 2025

CVE-2023-51277: n/a

Source CVE Database V5

Not known to be exploited · CVSS 9.8 Critical : upgrade to 0.1.6 as a priority.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

9.8Critical

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

EPSS: 1.0% chance of exploitation in 30 days – higher than 64% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 0.1.6

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
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: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to 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 5 Jan 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 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 tuxu/nbviewer-app to 0.1.6.

Affected software

Product	Affected	Fixed in
GitHubtuxu/nbviewer-app`pkg:github/tuxu/nbviewer-app`Other threats	Affected <0.1.6	Fixed in 0.1.6

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

AI-suggested

To mitigate CVE-2023-51277, European organizations should: 1) Immediately upgrade nbviewer-app to version 0.1.6 or later, where the 'get-task-allow' entitlement has been removed from release builds. 2) Audit existing deployments of nbviewer-app and related Jupyter Notebook tools to identify vulnerable versions. 3) Implement strict application whitelisting and sandboxing to limit the impact of potential exploitation. 4) Monitor network and system logs for unusual activity indicative of exploitation attempts, such as unexpected process debugging or code injection behaviors. 5) Employ endpoint detection and response (EDR) solutions capable of detecting privilege escalation or task port access anomalies. 6) Restrict network exposure of nbviewer-app instances, ideally limiting access to trusted internal networks or via VPN with strong authentication. 7) Educate developers and system administrators about the risks of entitlements like 'get-task-allow' in production environments to prevent similar misconfigurations. 8) Regularly review and update security policies governing the deployment of open-source tools and their configurations.

Description

nbviewer-app (aka Jupyter Notebook Viewer) before 0.1.6 has the get-task-allow entitlement for release builds.

Impact

For European organizations, the impact of CVE-2023-51277 can be substantial, especially those relying on Jupyter Notebook environments for data analysis, scientific research, or development workflows. Exploitation could lead to full system compromise, unauthorized data access, and disruption of critical services. Confidentiality breaches could expose sensitive research data or intellectual property, while integrity violations might allow attackers to alter code or data, undermining trust in analytical results. Availability impacts could disrupt operations, causing downtime and productivity losses. Given the remote exploitability without authentication or user interaction, attackers could target vulnerable systems en masse, increasing the risk of widespread incidents. Organizations in sectors such as academia, finance, healthcare, and technology, which heavily utilize Jupyter tools, are particularly at risk. Additionally, the vulnerability could be leveraged as a foothold for lateral movement within networks, amplifying its threat.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Jul 2025, 02:13 UTC

Technical details

References

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