How severe is CVE-2023-3253?

CVE-2023-3253 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2023-3253 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-3253?

CVE-2023-3253 affects Tenable Nessus. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-3253?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-3253 published?

CVE-2023-3253 was published on 2023-08-29 and last updated on 2026-06-17.

CVE-2023-3253

CVE-2023-3253 is a medium-severity vulnerability in Tenable Nessus with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Tenable Nessus
Published: 2023-08-29
Last modified: 2026-06-17

Description

An improper authorization vulnerability exists where an authenticated, low privileged remote attacker could view a list of all the users available in the application.

Frequently asked questions

What is CVE-2023-3253?: An improper authorization vulnerability exists where an authenticated, low privileged remote attacker could view a list of all the users available in the application.
How severe is CVE-2023-3253?: CVE-2023-3253 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2023-3253 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-3253?: CVE-2023-3253 affects Tenable Nessus. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-3253?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-3253 published?: CVE-2023-3253 was published on 2023-08-29 and last updated on 2026-06-17.

References

https://www.tenable.com/security/tns-2023-29

Affected products (1)

cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*

More vulnerabilities in Tenable Nessus

CVE-2022-23852 — Critical (CVSS 9.8): Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero…
CVE-2022-22824 — Critical (CVSS 9.8): defineAttribute in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
CVE-2022-22823 — Critical (CVSS 9.8): build_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
CVE-2022-22822 — Critical (CVSS 9.8): addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
CVE-2022-4313 — High (CVSS 8.8): A vulnerability was reported where through modifying the scan variables, an authenticated user in Tenable products,…
CVE-2023-0524 — High (CVSS 8.8): As part of our Security Development Lifecycle, a potential privilege escalation issue was identified internally. This…

All CVEs affecting Tenable Nessus →

Other CWE-863 (Incorrect Authorization) vulnerabilities

CVE-2026-48286 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) versions 7.4.3 build 9396 and earlier are affected by an Incorrect Authorization…
CVE-2026-48303 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) versions 7.4.3 build 9394 and earlier are affected by an Incorrect Authorization…
CVE-2026-44330 — Critical (CVSS 10.0): free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the…
CVE-2026-46595 — Critical (CVSS 10.0): Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of…
CVE-2026-33105 — Critical (CVSS 10.0): Improper authorization in Microsoft Azure Kubernetes Service allows an unauthorized attacker to elevate privileges over…
CVE-2026-32213 — Critical (CVSS 10.0): Improper authorization in Azure AI Foundry allows an unauthorized attacker to elevate privileges over a network.

Browse all CWE-863 (Incorrect Authorization) vulnerabilities →