How severe is CVE-2021-47765?

CVE-2021-47765 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-47765 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-47765?

CVE-2021-47765 affects Celestialsoftware Absolutetelnet. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-47765?

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

Does CVE-2021-47765 have an EU (EUVD) identifier?

Yes. CVE-2021-47765 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2772.

When was CVE-2021-47765 published?

CVE-2021-47765 was published on 2026-01-15 and last updated on 2026-06-17.

CVE-2021-47765

CVE-2021-47765 is a medium-severity vulnerability in Celestialsoftware Absolutetelnet with a CVSS 3.x base score of 5.5. 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-787.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v4: 6.7
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2772
Weakness: CWE-787
Affected product: Celestialsoftware Absolutetelnet
Published: 2026-01-15
Last modified: 2026-06-17

Description

AbsoluteTelnet 11.24 contains a denial of service vulnerability that allows local attackers to crash the application by manipulating username and error report fields. Attackers can trigger the crash by inserting 1000 characters into the username or email address fields, causing the application to become unresponsive.

Frequently asked questions

What is CVE-2021-47765?: AbsoluteTelnet 11.24 contains a denial of service vulnerability that allows local attackers to crash the application by manipulating username and error report fields. Attackers can trigger the crash by inserting 1000 characters into the username or email address fields, causing the application to become unresponsive.
How severe is CVE-2021-47765?: CVE-2021-47765 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-47765 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-47765?: CVE-2021-47765 affects Celestialsoftware Absolutetelnet. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-47765?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2021-47765 have an EU (EUVD) identifier?: Yes. CVE-2021-47765 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2772.
When was CVE-2021-47765 published?: CVE-2021-47765 was published on 2026-01-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:celestialsoftware:absolutetelnet:11.24:*:*:*:*:*:*:*

More vulnerabilities in Celestialsoftware Absolutetelnet

CVE-2020-37166 — Medium (CVSS 6.2): AbsoluteTelnet 11.12 contains a denial of service vulnerability in the SSH2 username input field that allows local…
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CVE-2021-47764 — Medium (CVSS 5.5): AbsoluteTelnet 11.24 contains a denial of service vulnerability that allows local attackers to crash the application by…

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