How severe is CVE-2018-20664?

CVE-2018-20664 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-2018-20664 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20664?

CVE-2018-20664 primarily affects Zohocorp Manageengine Adselfservice Plus. In total, 92 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-20664?

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-2018-20664 published?

CVE-2018-20664 was published on 2019-01-03 and last updated on 2026-06-17.

CVE-2018-20664

CVE-2018-20664 is a critical-severity vulnerability in Zohocorp Manageengine Adselfservice Plus 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-611.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Zohocorp Manageengine Adselfservice Plus
Published: 2019-01-03
Last modified: 2026-06-17

Description

Zoho ManageEngine ADSelfService Plus 5.x before build 5701 has XXE via an uploaded product license.

Frequently asked questions

What is CVE-2018-20664?: Zoho ManageEngine ADSelfService Plus 5.x before build 5701 has XXE via an uploaded product license.
How severe is CVE-2018-20664?: CVE-2018-20664 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-2018-20664 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20664?: CVE-2018-20664 primarily affects Zohocorp Manageengine Adselfservice Plus. In total, 92 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-20664?: 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-2018-20664 published?: CVE-2018-20664 was published on 2019-01-03 and last updated on 2026-06-17.

References

Affected products (92)

cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:4500:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5032:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5040:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5041:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5100:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5101:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5102:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5103:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5104:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5105:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5106:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5107:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5108:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5109:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5110:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5111:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5112:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5113:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5114:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5115:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5116:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5200:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5201:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5202:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5203:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5204:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5205:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5206:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5207:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5300:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5301:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5302:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5303:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5304:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5305:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5306:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5307:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5308:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5309:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:5.7:5310:*:*:*:*:*:*

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