CVE-2023-2391Public exploitNetwork attack vector

Browser script execution via unneutralized NTP input

Published Apr 28, 2023 · Updated Aug 2, 2024

Cross-site scripting in NETGEAR SRX5308 firmware 4.3.5-3 allows remote authenticated users to execute script through ntp.server2. The scgi-bin/platform.cgi time-zone page places the ntp.server2 query value into generated HTML without neutralizing executable markup. Administrative access is required to submit the value, and another user's browser must render the affected page, enabling session-context actions or page-content modification.

CVSS severity4.8
Medium
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in NETGEAR SRX5308 firmware 4.3.5-3 allows remote authenticated users to execute script through ntp.server2. The scgi-bin/platform.cgi time-zone page places the ntp.server2 query value into generated HTML without neutralizing executable markup. Administrative access is required to submit the value, and another user's browser must render the affected page, enabling session-context actions or page-content modification.

The record

CVE
CVE-2023-2391
Published
Apr 28, 2023
Updated
Aug 2, 2024
Vendor
NETGEAR
Product
ProSAFE Gigabit Quad WAN SSL VPN Firewall SRX5308
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.3.5-3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

NETGEAR · ProSAFE Gigabit Quad WAN SSL VPN Firewall SRX5308version=4.3.5-3

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.3VulDBAV:N/AC:L/Au:M/C:N/I:P/A:N
2.4VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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