CVE-2021-43271: Riverbed AppResponse 11.8.0, 11.8.5, 11.8.5a, 11.9.0, 11.9.0a, 11.10.0, 11.11.0, 11.11.0a, 11.11.1, 11.11.1a,

Routine

MEDIUM 6.8DOWNGRADE

CVE-2021-43271 is a medium-severity flaw (CVSS 6.8) affecting appresponse. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Riverbed AppResponse 11.8.0, 11.8.5, 11.8.5a, 11.9.0, 11.9.0a, 11.10.0, 11.11.0, 11.11.0a, 11.11.1, 11.11.1a, 11.11.5, and 11.11.5a (when configured to use local, RADIUS, or TACACS authentication) logs usernames and passwords if either is entered incorrectly. If a user enters an incorrect username and/or password when logging into the WebUI, these attempted credentials are included in an error message that is logged in the WebUI log file. A log e

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-532
Published	2022-06-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: riverbed

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-06-03 20:15 UTCPublished CVE record published
2026-06-17 04:10 UTCUpdated Record last modified

riverbed appresponse DOWNGRADE

Affected: 11.8.0 · 11.8.5 · 11.8.5a · 11.9.0 · 11.9.0a · 11.10.0 · 11.11.0 · 11.11.0a

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.8.0

1. Check installed version

apt-cache policy appresponse || rpm -q appresponse || appresponse --version

2. No fixed release: DOWNGRADE to a release before 11.8.0 (Debian / Ubuntu)

apt-cache madison appresponse sudo apt install appresponse=<VERSION_BEFORE_11.8.0> sudo apt-mark hold appresponse

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list appresponse sudo dnf downgrade appresponse-<VERSION_BEFORE_11.8.0> sudo dnf versionlock add appresponse

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-43271?

appresponse: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-43271 being exploited?

CVE-2021-43271 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-43271 affect?

CVE-2021-43271 affects appresponse. Severity is medium (CVSS 6.8). Riverbed AppResponse 11.8.0, 11.8.5, 11.8.5a, 11.9.0, 11.9.0a, 11.10.0, 11.11.0, 11.11.0a, 11.11.1, 11.11.1a, 11.11.5, and 11.11.5a (when configured to use local, RADIUS, or TACACS authentication) logs usernames and passwords if either is e

How urgent is CVE-2021-43271?

Priority 38/100. No elevated risk signals yet.

References

← Back to latest CVEs