How severe is CVE-2017-16861?

CVE-2017-16861 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-16861 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-16861?

CVE-2017-16861 primarily affects Atlassian Fisheye. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-16861?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2017-16861 published?

CVE-2017-16861 was published on 2018-02-01 and last updated on 2026-06-17.

CVE-2017-16861

CVE-2017-16861 is a critical-severity vulnerability in Atlassian Fisheye with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Atlassian Fisheye
Published: 2018-02-01
Last modified: 2026-06-17

Description

It was possible for double OGNL evaluation in certain redirect action and in WebWork URL and Anchor tags in JSP files to occur. An attacker who can access the web interface of Fisheye or Crucible or who hosts a website that a user who can access the web interface of Fisheye or Crucible visits, is able to exploit this vulnerability to execute Java code of their choice on systems that run a vulnerable version of Fisheye or Crucible. All versions of Fisheye and Crucible before 4.4.5 (the fixed version for 4.4.x) and from 4.5.0 before 4.5.2 (the fixed version for 4.5.x) are affected by this vulnerability.

Frequently asked questions

What is CVE-2017-16861?: It was possible for double OGNL evaluation in certain redirect action and in WebWork URL and Anchor tags in JSP files to occur. An attacker who can access the web interface of Fisheye or Crucible or who hosts a website that a user who can access the web interface of Fisheye or Crucible visits, is able to exploit this vulnerability to execute Java code of their choice on systems that run a vulnerable version of Fisheye or Crucible. All versions of Fisheye and Crucible before 4.4.5 (the fixed version for 4.4.x) and from 4.5.0 before 4.5.2 (the fixed version for 4.5.x) are affected by this vulnerability.
How severe is CVE-2017-16861?: CVE-2017-16861 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-16861 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-16861?: CVE-2017-16861 primarily affects Atlassian Fisheye. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-16861?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-16861 published?: CVE-2017-16861 was published on 2018-02-01 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:atlassian:fisheye:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:crucible:*:*:*:*:*:*:*:*

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