Detections
Analytics

Echo: System.Text.Encodings.Web: security update to 4.0.0+echo.1

high Tenable Self-Hosted Container Security Plugin ID 461159

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests.
 NOTE: Microsoft has not commented on third-party claims that the issue is that the TextEncoder.EncodeCore
 function in the System.Text.Encodings.Web package in ASP.NET Core Mvc before 1.0.4 and 1.1.x before 1.1.3
 allows remote attackers to cause a denial of service by leveraging failure to properly calculate the
 length of 4-byte characters in the Unicode Non-Character range. (CVE-2017-0247)

Solution

Update the System.Text.Encodings.Web library and its related packages to version 4.0.0+echo.1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2017-0247

Plugin Details

Severity: High

ID: 461159

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/3/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 95.09

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2017-0247

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/17/2026

Vulnerability Publication Date: 5/10/2017

Reference Information

CVE: CVE-2017-0247