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Goahead CVE-2020-15688

HIGH
Authentication Bypass by Capture-replay (CWE-294)
2020-07-23 cve@mitre.org
8.8
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Replay attack prevention
Impact

CVSS score of 8.8 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required. Public proof-of-concept exploit code is available.

Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 4.0% exploitation probability (EPSS)

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AnalysisAI

The HTTP Digest Authentication in the GoAhead web server before 5.1.2 does not completely protect against replay attacks. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-294. The HTTP Digest Authentication in the GoAhead web server before 5.1.2 does not completely protect against replay attacks. This allows an unauthenticated remote attacker to bypass authentication via capture-replay if TLS is not used to protect the underlying communication channel. Affected products include: Embedthis Goahead. Version information: before 5.1.2.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionNVD

The HTTP Digest Authentication in the GoAhead web server before 5.1.2 does not completely protect against replay attacks. This allows an unauthenticated remote attacker to bypass authentication via capture-replay if TLS is not used to protect the underlying communication channel.

Threat Intelligence Overview

EPSS Score
4.0%
Top 11% exploitable
Exploit
POC
Public exploit code exists
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC Yes
EPSS 4.0%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

68
Low Medium High Critical
KEV: 0
EPSS: +4
CVSS: +44
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:a:embedthis:goahead:*:*:*:*:*:*:*:*
CVE-2017-17562 HIGH POC
8.1 Dec 12

Embedthis GoAhead before 3.6.5 allows remote code execution if CGI is enabled and a CGI program is dynamically linked. R

CVE-2014-9707 HIGH POC
7.5 Mar 31

EmbedThis GoAhead 3.0.0 through 3.4.1 does not properly handle path segments starting with a . Rated high severity (CVSS

CVE-2017-5674 CRITICAL POC
9.8 Mar 13

A vulnerability in a custom-built GoAhead web server used on Foscam, Vstarcam, and multiple white-label IP camera models

CVE-2019-5096 CRITICAL POC
9.8 Dec 03

An exploitable code execution vulnerability exists in the processing of multi-part/form-data requests within the base Go

CVE-2017-5675 HIGH POC
8.8 Mar 13

A command-injection vulnerability exists in a web application on a custom-built GoAhead web server used on Foscam, Vstar

CVE-2019-16645 HIGH POC
8.6 Sep 20

An issue was discovered in Embedthis GoAhead 2.5.0. Rated high severity (CVSS 8.6), this vulnerability is remotely explo

CVE-2017-14149 HIGH POC
7.5 Sep 05

GoAhead 3.4.0 through 3.6.5 has a NULL Pointer Dereference in the websDecodeUrl function in http.c, leading to a crash f

CVE-2019-5097 HIGH POC
7.5 Dec 03

A denial-of-service vulnerability exists in the processing of multi-part/form-data requests in the base GoAhead web serv

CVE-2018-15505 HIGH POC
7.5 Aug 18

An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2. Rated high severity (CVSS 7.5), this

CVE-2018-15504 HIGH POC
7.5 Aug 18

An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2. Rated high severity (CVSS 7.5), this

CVE-2021-42342 CRITICAL
9.8 Oct 14

An issue was discovered in GoAhead 4.x and 5.x before 5.1.5. Rated critical severity (CVSS 9.8), this vulnerability is r

CVE-2019-19240 MEDIUM POC
5.3 Nov 22

Embedthis GoAhead before 5.0.1 mishandles redirected HTTP requests with a large Host header. Rated medium severity (CVSS

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