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CVE Record

CVE-2021-20576: IBM Security Verify Access 20.07 could allow a remote attacker to send a specially crafted HTTP GET request...

IBM Security Verify Access 20.07 could allow a remote attacker to send a specially crafted HTTP GET request that could cause the application to crash.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

IBM Security Verify Access 20.07 can be crashed remotely by a specially crafted HTTP GET request. The known impact is service availability loss, not data theft or privilege escalation. Because it is network-reachable and requires no authentication, exposed deployments should be treated as high priority for availability risk.

Executive priority

Prioritize remediation for externally reachable deployments because an unauthenticated remote actor could disrupt authentication or access services. The business concern is outage risk, not confirmed compromise, based on the provided sources.

Technical view

CVE-2021-20576 is a denial-of-service flaw in IBM Security Verify Access 20.07. CVSS 3.0 is 7.5 with AV:N, AC:L, PR:N, UI:N, and A:H, indicating unauthenticated remote reachability and high availability impact. No CWE or CPE details are provided in the bundle.

Likely exposure

Exposure is limited to IBM Security Verify Access version 20.07, especially internet-facing or broadly reachable deployments. The bundle does not identify other affected versions or specific components beyond IBM's X-Force naming of an App Gateway DoS entry.

Exploitation context

The source bundle does not show CISA KEV inclusion or active exploitation reporting. CVSS lists exploit code maturity as unproven. Treat exploitation as plausible where the service is reachable, but do not claim observed exploitation from these sources.

Researcher notes

Evidence is concise and vendor-backed but lacks detailed root cause, CWE, CPEs, and named fixed versions in the provided bundle. Validate scope directly against IBM advisory and X-Force entry before expanding affected-version assumptions.

Mitigation direction

  • Review IBM advisory 6457315 and apply the vendor-recommended fix or upgrade path.
  • Inventory IBM Security Verify Access deployments and identify any running version 20.07.
  • Reduce unnecessary external access to affected services until remediation is complete.
  • Monitor affected services for crashes, restarts, and availability degradation.

Validation and detection

  • Confirm whether any IBM Security Verify Access instance reports version 20.07.
  • Check change records for IBM advisory 6457315 remediation or vendor-approved upgrade completion.
  • Review service logs and uptime data for unexplained crashes or restarts.
  • Verify exposed routes are limited to required networks and business use cases.
Prepared
Confidence
medium
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

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CVE-2021-20576 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/PR:N/S:U/C:N/AC:L/A:H/I:N/UI: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
7.5CVSS 3.0HighCVSS:3.0/AV:N/PR:N/S:U/C:N/AC:L/A:H/I:N/UI:N/E:U/RC:C/RL:O3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

7.5High
CVSS 3.0 vector shape for CVE-2021-20576Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/PR:N/S:U/C:N/AC:L/A:H/I:N/UI: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
IBMSecurity Verify Access20.07Listed
Weakness

CWE details

No CWE listed

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