How severe is CVE-2021-27760?

CVE-2021-27760 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2021-27760 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27760?

CVE-2021-27760 primarily affects Hcltech Hcl Inotes. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27760?

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

When was CVE-2021-27760 published?

CVE-2021-27760 was published on 2022-05-06 and last updated on 2026-06-17.

CVE-2021-27760

CVE-2021-27760 is a medium-severity vulnerability in Hcltech Hcl Inotes with a CVSS 3.x base score of 4.6. 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 4.6)
CVSS v2: 6.0
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Hcltech Hcl Inotes
Published: 2022-05-06
Last modified: 2026-06-17

Description

An issue was discovered in the Sametime chat feature in the Notes 11.0 - 11.0.1 FP4 clients. An authenticated Sametime chat user could cause Remote Code Execution on another chat client by sending a specially formatted message through chat containing Javascript code.

Frequently asked questions

What is CVE-2021-27760?: An issue was discovered in the Sametime chat feature in the Notes 11.0 - 11.0.1 FP4 clients. An authenticated Sametime chat user could cause Remote Code Execution on another chat client by sending a specially formatted message through chat containing Javascript code.
How severe is CVE-2021-27760?: CVE-2021-27760 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2021-27760 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27760?: CVE-2021-27760 primarily affects Hcltech Hcl Inotes. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27760?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27760 published?: CVE-2021-27760 was published on 2022-05-06 and last updated on 2026-06-17.

References

https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0097670

Affected products (6)

cpe:2.3:a:hcltech:hcl_inotes:11.0.0:*:*:*:*:*:*:*
cpe:2.3:a:hcltech:hcl_inotes:11.0.1:-:*:*:*:*:*:*
cpe:2.3:a:hcltech:hcl_inotes:11.0.1:fixpack1:*:*:*:*:*:*
cpe:2.3:a:hcltech:hcl_inotes:11.0.1:fixpack2:*:*:*:*:*:*
cpe:2.3:a:hcltech:hcl_inotes:11.0.1:fixpack3:*:*:*:*:*:*
cpe:2.3:a:hcltech:hcl_inotes:11.0.1:fixpack4:*:*:*:*:*:*

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