CVE-2021-42761

Q: How do I fix CVE-2021-42761?

Upgrade fortiweb to 7.0.0 or later.

Q: Is CVE-2021-42761 being actively exploited?

Not that we know of. CVE-2021-42761 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 71% of all scored CVEs.

Q: How severe is CVE-2021-42761?

CVE-2021-42761 has a CVSS v3 base score of 9.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-42761 affect?

Published advisories record a fix for fortiweb (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALEPSS 71th pctl

9.0

CVSS v3

NVD

Description

A condition for session fixation vulnerability [CWE-384] in the session management of FortiWeb versions 6.4 all versions, 6.3.0 through 6.3.16, 6.2.0 through 6.2.6, 6.1.0 through 6.1.2, 6.0.0 through 6.0.7, 5.9.0 through 5.9.1 may allow a remote, unauthenticated attacker to infer the session identifier of other users and possibly usurp their session.

CWE-384

How to fix

Remediation Available

fortiwebNVD

Affected:>= 6.4.0, < 7.0.0Fixed in:7.0.0CVE-2021-42761derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.47%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Vendor Advisory1

fortiguard.com

Related Vulnerabilities

Other CWE-384 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-11714	Critical	9.8	32%	-	-
CVE-2019-12258	High	7.5	23%	-	Fix
CVE-2019-10008	High	8.8	22%	-	-
CVE-2018-17199	High	7.5	21%	-	Fix
CVE-2024-50339	Medium	5.3	20%	-	Fix
CVE-2018-18925	Critical	9.8	18%	-	-

Common questions

How do I fix CVE-2021-42761?

Upgrade fortiweb to 7.0.0 or later.

Is CVE-2021-42761 being actively exploited?

Not that we know of. CVE-2021-42761 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 71% of all scored CVEs.

How severe is CVE-2021-42761?

CVE-2021-42761 has a CVSS v3 base score of 9.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-42761 affect?

Published advisories record a fix for fortiweb (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2021-42761

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.