Review reviewHigh

CVE-2021-46010

a3100r firmware, a3100r

Totolink A3100R V5.9c.4577 suffers from Use of Insufficiently Random Values via the web configuration. The SESSION_ID is predictable. An attacker can hijack a valid session and conduct further malicious operations.

CVSS
8.8
EPSS
1.21%
65.6% percentile
CISA KEV
Not listed
Published
2022.03.31
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability1.21%
Technical severityCVSS 8.8

Vulnerability overview

Totolink A3100R V5.9c.4577 suffers from Use of Insufficiently Random Values via the web configuration. The SESSION_ID is predictable. An attacker can hijack a valid session and conduct further malicious operations.

Affected product and versions

Product
a3100r firmware, a3100r
Affected versions
5.9c.4577
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that a3100r firmware, a3100r and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-330