CVE-2023-27378Network attack vector

Logged-in user script execution via reflected input

Published May 3, 2023 · Updated Jan 29, 2025

Reflected XSS in the F5 BIG-IP Configuration utility allows remote attackers to run JavaScript as a currently logged-in user. F5 identifies multiple affected pages but has not disclosed the request parameters or the output-encoding failure that reflects attacker-controlled input. Exploitation requires user interaction and an active Configuration utility session; successful script execution inherits that user's browser context.

CVSS severity7.5
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in the F5 BIG-IP Configuration utility allows remote attackers to run JavaScript as a currently logged-in user. F5 identifies multiple affected pages but has not disclosed the request parameters or the output-encoding failure that reflects attacker-controlled input. Exploitation requires user interaction and an active Configuration utility session; successful script execution inherits that user's browser context.

The record

CVE
CVE-2023-27378
Published
May 3, 2023
Updated
Jan 29, 2025
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 2025Record 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=13.1.0 <*
  2. Affected versionversion=14.1.0 <14.1.5.4
  3. Affected versionversion=15.1.0 <15.1.8.2
  4. Affected versionversion=16.1.0 <16.1.3.4
  5. Affected versionversion=17.0.0 <*
  6. Affected versionversion=17.1.0 <17.1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=13.1.0 <*; version=14.1.0 <14.1.5.4; version=15.1.0 <15.1.8.2; version=16.1.0 <16.1.3.4; version=17.0.0 <*; version=17.1.0 <17.1.0.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.5F5 NetworksCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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