How severe is CVE-2018-20339?

CVE-2018-20339 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-20339 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20339?

CVE-2018-20339 primarily affects Zohocorp Manageengine Opmanager. In total, 152 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-20339?

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

When was CVE-2018-20339 published?

CVE-2018-20339 was published on 2018-12-21 and last updated on 2026-06-17.

CVE-2018-20339

CVE-2018-20339 is a medium-severity vulnerability in Zohocorp Manageengine Opmanager with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Zohocorp Manageengine Opmanager
Published: 2018-12-21
Last modified: 2026-06-17

Description

Zoho ManageEngine OpManager 12.3 before build 123239 allows XSS in the Notes column of the Alarms section.

Frequently asked questions

What is CVE-2018-20339?: Zoho ManageEngine OpManager 12.3 before build 123239 allows XSS in the Notes column of the Alarms section.
How severe is CVE-2018-20339?: CVE-2018-20339 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-20339 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20339?: CVE-2018-20339 primarily affects Zohocorp Manageengine Opmanager. In total, 152 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-20339?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20339 published?: CVE-2018-20339 was published on 2018-12-21 and last updated on 2026-06-17.

References

Affected products (152)

cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build12300:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123001:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123002:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123003:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123004:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123005:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123006:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123007:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123008:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123009:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123010:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123011:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123012:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123013:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123014:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123015:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123021:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123022:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123023:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123024:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123025:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123026:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123027:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123028:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123029:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123030:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123031:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123032:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123033:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123034:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123035:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123036:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123037:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123043:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123044:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123045:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123046:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123047:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123048:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.3:build123049:*:*:*:*:*:*

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