Security readout for executives and security teams
Plain-English summary
This is a high-severity IBM Aspera flaw that can corrupt memory in certain configurations. A low-privileged attacker with detailed system knowledge could execute code or cause a denial of service through the HTTP fallback service. The impact is serious where affected Aspera systems support critical file-transfer workflows.
Executive priority
Treat this as a priority for Aspera environments supporting sensitive or business-critical file transfer. The risk is not proven mass exploitation, but successful abuse could disrupt availability or compromise data integrity and confidentiality.
Technical view
CVE-2020-4435 affects specified IBM Aspera products and versions. The CVSS 3.0 score is 7.5 with network access, low privileges, high attack complexity, no user interaction, and high confidentiality, integrity, and availability impact. The vulnerable path is the HTTP fallback service, with arbitrary memory corruption as the reported weakness.
Likely exposure
Exposure is most likely in organizations running the listed IBM Aspera Transfer, Server, Endpoint, Proxy, Faspex, Shares, Streaming, or On Demand versions, particularly where HTTP fallback is enabled and reachable over the network.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. IBM describes potential code execution or denial of service, but exploitation requires low privileges, high complexity, and intimate knowledge of the system.
Researcher notes
Do not assume all Aspera deployments are affected. Validate the exact product, version, configuration, and HTTP fallback exposure. Evidence is incomplete on fixed versions in the supplied bundle, so rely on IBM advisory guidance for remediation specifics.
Mitigation direction
- Inventory IBM Aspera products and versions against the affected list.
- Review IBM advisory 6221324 and apply vendor-directed remediation.
- Reduce network exposure for HTTP fallback services where operationally feasible.
- Limit access to Aspera services to trusted users and networks.
- Monitor vendor guidance for exact fixes or configuration changes.
Validation and detection
- Confirm installed Aspera product names and versions.
- Verify whether HTTP fallback is enabled and externally reachable.
- Check change records for IBM-directed updates or configuration remediation.
- Review service logs for crashes, restarts, or unusual authenticated activity.
- Document systems that remain exposed pending vendor remediation.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-4435 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
- High
- CVSS
- 7.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/I:H/AC:H/UI:N/A:H/AV:N/C:H/S:U/PR:L/RL:O/E:U/RC:C
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:3.0/I:H/AC:H/UI:N/A:H/AV:N/C:H/S:U/PR:L/RL:O/E:U/RC:C1.65.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.5HighVector: CVSS:3.0/I:H/AC:H/UI:N/A:H/AV:N/C:H/S:U/PR:L/RL:O/E:U/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://www.ibm.com/support/pages/node/6221324CVE reference · x_refsource_CONFIRM
- ibm-aspera-cve20204435-command-exec (180901)CVE reference · vdb-entry, x_refsource_XF
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.