How severe is CVE-2016-5229?

CVE-2016-5229 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-2016-5229 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-5229?

CVE-2016-5229 primarily affects Atlassian Bamboo. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-5229?

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-2016-5229 published?

CVE-2016-5229 was published on 2016-08-02 and last updated on 2026-06-17.

CVE-2016-5229

CVE-2016-5229 is a critical-severity vulnerability in Atlassian Bamboo 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. The underlying weakness is classified as CWE-284.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Atlassian Bamboo
Published: 2016-08-02
Last modified: 2026-06-17

Description

Atlassian Bamboo before 5.11.4.1 and 5.12.x before 5.12.3.1 does not properly restrict permitted deserialized classes, which allows remote attackers to execute arbitrary code via vectors related to XStream Serialization.

Frequently asked questions

What is CVE-2016-5229?: Atlassian Bamboo before 5.11.4.1 and 5.12.x before 5.12.3.1 does not properly restrict permitted deserialized classes, which allows remote attackers to execute arbitrary code via vectors related to XStream Serialization.
How severe is CVE-2016-5229?: CVE-2016-5229 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-2016-5229 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-5229?: CVE-2016-5229 primarily affects Atlassian Bamboo. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-5229?: 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-2016-5229 published?: CVE-2016-5229 was published on 2016-08-02 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:atlassian:bamboo:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:bamboo:5.12.0:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:bamboo:5.12.1:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:bamboo:5.12.2:*:*:*:*:*:*:*

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