CVE-2023-30802VulnerabilityPublished 10 Oct 2023Updated 28 Nov 2025

CVE-2023-30802: Sangfor Net-Gen Application Firewall · Inclusion of Sensitive Information in Source Code

Affects Sangfor Net-Gen Application FirewallSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

5.3Medium

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

EPSS: 0.8% chance of exploitation in 30 days – higher than 56% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

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

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: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within 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 10 Oct 2023
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

Affected software

Product	Affected	Fixed in
Sangfor Net-Gen Application Firewall	Affected =8.0.17	Fixed in–

AI-suggested

Immediate mitigation steps include restricting external network access to the Sangfor Net-Gen Application Firewall management interfaces and administrative endpoints to trusted internal networks only. Network-level filtering should be applied to block malformed HTTP requests, particularly those with suspicious or invalid Content-Length headers. Organizations should implement strict monitoring and alerting for anomalous HTTP traffic patterns targeting the firewall. Until an official patch is released, consider deploying web application firewalls or intrusion prevention systems to detect and block exploitation attempts. Conduct a thorough audit of firewall configurations and logs to identify any signs of exploitation. Engage with Sangfor support to obtain timelines for patches or recommended workarounds. Additionally, review and rotate any credentials or secrets that may have been exposed due to this vulnerability. Incorporate this vulnerability into vulnerability management and incident response plans to ensure rapid detection and remediation.

Description

The Sangfor Next-Gen Application Firewall version NGAF8.0.17 is vulnerable to a source code disclosure vulnerability. A remote and unauthenticated attacker can obtain PHP source code by sending an HTTP request with an invalid Content-Length field.

Impact

For European organizations, this vulnerability poses a risk of sensitive information leakage from the Sangfor Net-Gen Application Firewall, potentially exposing internal firewall logic, credentials, or configuration details. Such exposure can aid attackers in crafting more effective attacks, including evasion of firewall rules or lateral movement within networks. Organizations in critical infrastructure sectors (e.g., energy, finance, telecommunications) that deploy Sangfor firewalls may face increased risk of targeted attacks leveraging this vulnerability. The confidentiality breach could lead to compliance issues under GDPR if personal or sensitive data is indirectly exposed. Although the vulnerability does not directly disrupt service availability or data integrity, the indirect consequences of information disclosure can be severe, including facilitating subsequent attacks or unauthorized access. The lack of authentication and user interaction requirements means attackers can exploit this vulnerability remotely and at scale if the firewall is exposed to untrusted networks.

CWE-540Inclusion of Sensitive Information in Source Code (opens in a new tab)
Base weaknessOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
Source code on a web server or repository often contains sensitive information and should generally not be accessible to users.
Architecture and Design · System Configuration
Recommendations include removing this script from the web server and moving it to a location not accessible from the Internet.
OWASP Cheat Sheets
Error Handling (opens in a new tab)
Logging (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V8.3.4 (opens in a new tab)
V14.3.3 (opens in a new tab)
V7.3.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 28 Nov 2025, 16:24 UTC

WeaknessesCWE-540

Technical details

References

Community reviews

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