How severe is CVE-2017-3839?

CVE-2017-3839 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-2017-3839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-3839?

CVE-2017-3839 affects Cisco Secure Access Control System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-3839?

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

When was CVE-2017-3839 published?

CVE-2017-3839 was published on 2017-02-22 and last updated on 2026-06-17.

CVE-2017-3839

CVE-2017-3839 is a medium-severity vulnerability in Cisco Secure Access Control System 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-611.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Cisco Secure Access Control System
Published: 2017-02-22
Last modified: 2026-06-17

Description

An XML External Entity vulnerability in the web-based user interface of the Cisco Secure Access Control System (ACS) could allow an unauthenticated, remote attacker to have read access to part of the information stored in the affected system. More Information: CSCvc04845. Known Affected Releases: 5.8(2.5).

Frequently asked questions

What is CVE-2017-3839?: An XML External Entity vulnerability in the web-based user interface of the Cisco Secure Access Control System (ACS) could allow an unauthenticated, remote attacker to have read access to part of the information stored in the affected system. More Information: CSCvc04845. Known Affected Releases: 5.8(2.5).
How severe is CVE-2017-3839?: CVE-2017-3839 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-2017-3839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-3839?: CVE-2017-3839 affects Cisco Secure Access Control System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-3839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-3839 published?: CVE-2017-3839 was published on 2017-02-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cisco:secure_access_control_system:5.8\(2.5\):*:*:*:*:*:*:*

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