Security readout for executives and security teams
Plain-English summary
AbsoluteTelnet 11.24 can be crashed by a local user who enters oversized data into certain application fields. This is an availability issue, not evidence of data theft or remote compromise. Business urgency is highest where this client is used for critical terminal, SSH, Telnet, or dial-up workflows on shared or loosely controlled workstations.
Executive priority
Treat as a moderate endpoint availability risk. Prioritize remediation where AbsoluteTelnet supports critical operations or is installed on shared workstations. This does not currently justify emergency response absent evidence of active exploitation or remote attack capability.
Technical view
CVE-2021-47764 affects Celestial Software AbsoluteTelnet 11.24. The provided record describes a local denial-of-service condition involving DialUp connection and license name fields. CVSS v4.0 is 6.7 with local attack vector, low complexity, no privileges, and user interaction required. CWE-787 is listed, but public details only support application crash impact.
Likely exposure
Exposure is limited to systems running AbsoluteTelnet 11.24 where an attacker or untrusted local user can interact with the application UI. It is less concerning on single-user, tightly managed endpoints. No source provided indicates network-reachable exploitation.
Exploitation context
A public Exploit-DB entry exists for a proof of concept. The CVE is not listed as CISA KEV in the provided bundle, and there is no cited evidence of active exploitation. The described impact is forced application termination, which could disrupt sessions or operational workflows.
Researcher notes
Public evidence indicates a local UI-triggered crash in AbsoluteTelnet 11.24, with Exploit-DB publication. The bundle does not name a patched version, vendor advisory, or broader affected range. Do not assume impact beyond denial of service without additional vendor or maintainer confirmation.
Mitigation direction
- Identify endpoints running AbsoluteTelnet 11.24.
- Check Celestial Software guidance for updates or fixed versions.
- Restrict local access to systems using AbsoluteTelnet.
- Avoid shared use of affected workstations by untrusted users.
- Consider alternative clients if no vendor fix is available.
Validation and detection
- Inventory installed AbsoluteTelnet versions across managed endpoints.
- Confirm whether version 11.24 is present.
- Review who can locally access affected systems.
- Assess whether AbsoluteTelnet supports critical business workflows.
- Monitor vendor and CVE sources for remediation updates.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-47764 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.7MediumVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-50511CVE reference · exploit
- Vendor HomepageCVE reference · product
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.