CVE-2021-22934Network attack vector

Memory corruption via crafted web request

Published Aug 16, 2021 · Updated Aug 3, 2024

Buffer overflow in Pulse Secure Pulse Connect Secure before 9.1R12 allows remote authenticated users to corrupt memory via a crafted web request. The vendor identifies only a malicious web request as the trigger and has not published the affected handler, buffer operation, or input field. Reaching the flaw requires administrator access or control of another gateway in a load-balanced deployment; the record does not specify whether corruption causes a crash or code execution.

CVSS severity7.2
High
EPSS probability4.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Pulse Secure Pulse Connect Secure before 9.1R12 allows remote authenticated users to corrupt memory via a crafted web request. The vendor identifies only a malicious web request as the trigger and has not published the affected handler, buffer operation, or input field. Reaching the flaw requires administrator access or control of another gateway in a load-balanced deployment; the record does not specify whether corruption causes a crash or code execution.

The record

CVE
CVE-2021-22934
Published
Aug 16, 2021
Updated
Aug 3, 2024
Vendor
Pulse Secure
Product
Pulse Connect Secure
Classifications
CWE-120, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=Fixed in 9.1R12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Pulse Secure · Pulse Connect Secureversion=Fixed in 9.1R12

Published CVSS scores

7.2NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1190Exploit Public-Facing Application

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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