Security readout for executives and security teams
Plain-English summary
CVE-2021-45711 is a Rust dependency issue in simple_asn1 0.6.0. Malformed UTCTime ASN.1 data from a remote attacker can make the library panic. The main business risk is service interruption in software that parses attacker-controlled ASN.1 data through this crate.
Executive priority
Treat as a targeted dependency remediation item, not an emergency. Prioritize internet-facing or high-availability services that parse untrusted ASN.1 data.
Technical view
simple_asn1 0.6.0 before 0.6.1 can panic when parsing UTCTime data whose second character is greater than 0x7f. The provided sources do not list CVSS, CWE, affected applications, or active exploitation. Impact depends on whether an application parses untrusted ASN.1 input with the vulnerable crate version.
Likely exposure
Exposure is likely limited to Rust applications or services using simple_asn1 0.6.0, directly or transitively, especially where ASN.1 UTCTime input can be remote-controlled.
Exploitation context
The sources describe a remote attacker-supplied input causing a panic. They do not state active exploitation, public exploit availability, KEV listing, or broader compromise impact.
Researcher notes
Evidence is sparse: the bundle names the vulnerable crate version, fixed version boundary, and panic condition only. No CVSS, CWE, exploit evidence, or affected downstream products are provided.
Mitigation direction
- Upgrade simple_asn1 to 0.6.1 or later where the crate is directly or transitively used.
- Check upstream application and dependency advisories for vendor-specific rollout guidance.
- Limit untrusted ASN.1 parsing paths until affected dependencies are updated.
- Run regression tests around certificate, token, or ASN.1 handling after updating.
Validation and detection
- Review Rust dependency manifests and lockfiles for simple_asn1 version 0.6.0.
- Identify services that parse ASN.1 or UTCTime data from remote or user-controlled sources.
- Confirm deployed builds no longer include simple_asn1 0.6.0.
- Verify error handling around malformed ASN.1 input does not terminate the service.
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
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CVE-2021-45711 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://rustsec.org/advisories/RUSTSEC-2021-0125.htmlCVE reference · x_refsource_MISC
- https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/simple_asn1/RUSTSEC-2021-0125.mdCVE reference · x_refsource_MISC
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.