LiveActive security incident?Get immediate response
CVE Record

CVE-2021-29695: IBM Host firmware for LC-class Systems could allow a remote attacker to traverse directories on the system.

IBM Host firmware for LC-class Systems could allow a remote attacker to traverse directories on the system. An attacker could send a specially-crafted URL request that would allow them to delete arbitrary files on the system. IBM X-Force ID: 200558.

MediumCVSS 4.9Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-29695 affects IBM LC-class host firmware on specific OP820 systems. A highly privileged remote attacker could abuse directory traversal in a crafted URL request to delete arbitrary files. The business risk is targeted integrity damage to firmware-managed systems, not broad unauthenticated compromise.

Executive priority

Treat this as a moderate, asset-specific firmware risk. Prioritize systems where firmware management is reachable beyond a tightly controlled admin network or where privileged account controls are weak.

Technical view

The CVSS 3.0 vector is 4.9 medium: AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N. IBM describes a directory traversal issue in host firmware allowing arbitrary file deletion through a specially crafted URL request. Affected products are IBM 8335-GTB, 8335-GTA, and 8335-GCA running OP820.

Likely exposure

Exposure appears limited to IBM LC-class systems listed by IBM running OP820 firmware. Risk depends on whether the affected firmware interface is reachable by network users who already hold high privileges.

Exploitation context

The provided bundle does not show CISA KEV listing or active exploitation. Exploitation requires network access and high privileges, with low attack complexity and no user interaction according to CVSS.

Researcher notes

Evidence is complete for affected IBM machine types, OP820 firmware, impact, and CVSS. The provided sources do not include exploit details, observed exploitation, CWE mapping, or specific fixed firmware version in the bundle.

Mitigation direction

  • Identify IBM 8335-GTB, 8335-GTA, and 8335-GCA systems running OP820.
  • Review IBM advisory 6454303 for official fixed firmware or mitigation guidance.
  • Limit affected firmware interface access to trusted administrative networks and accounts.
  • Verify privileged account hygiene for users able to reach firmware management paths.
  • Maintain recoverable backups for firmware-managed configuration and critical system files.

Validation and detection

  • Inventory firmware versions on IBM LC-class assets against the affected OP820 version.
  • Confirm whether any affected management interface is network reachable.
  • Review logs for suspicious privileged URL requests or unexpected file deletion events.
  • Confirm remediation status against IBM support advisory 6454303.
  • Document any compensating controls if firmware cannot be updated promptly.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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.

cve · low confidence lookup

CVE-2021-29695 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.9 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/PR:H/S:U/UI:N/AC:L/C:N/I:H/AV:N/A:N/E:U/RC:C/RL:O

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
4.9CVSS 3.0MediumCVSS:3.0/PR:H/S:U/UI:N/AC:L/C:N/I:H/AV:N/A:N/E:U/RC:C/RL:O1.23.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

4.9Medium
CVSS 3.0 vector shape for CVE-2021-29695Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/PR:H/S:U/UI:N/AC:L/C:N/I:H/AV:N/A:N/E:U/RC:C/RL:O

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
IBM8335-GTBOP820Listed
IBM8335-GTAOP820Listed
IBM8335-GCAOP820Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.