How severe is CVE-2026-21640?

CVE-2026-21640 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-21640 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21640?

CVE-2026-21640 affects Aquaplatform Revive Adserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21640?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21640 have an EU (EUVD) identifier?

Yes. CVE-2026-21640 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3329.

When was CVE-2026-21640 published?

CVE-2026-21640 was published on 2026-01-20 and last updated on 2026-06-17.

CVE-2026-21640

CVE-2026-21640 is a low-severity vulnerability in Aquaplatform Revive Adserver with a CVSS 3.x base score of 2.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-134.

Key facts

Severity: Low (CVSS 3.x base score 2.7)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3329
Weakness: CWE-134
Affected product: Aquaplatform Revive Adserver
Published: 2026-01-20
Last modified: 2026-06-17

Description

HackerOne community member Faraz Ahmed (PakCyberbot) has reported a format string injection in the Revive Adserver settings. When specific character combinations are used in a setting, the admin user console could be disabled due to a fatal PHP error.

Frequently asked questions

What is CVE-2026-21640?: HackerOne community member Faraz Ahmed (PakCyberbot) has reported a format string injection in the Revive Adserver settings. When specific character combinations are used in a setting, the admin user console could be disabled due to a fatal PHP error.
How severe is CVE-2026-21640?: CVE-2026-21640 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-21640 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21640?: CVE-2026-21640 affects Aquaplatform Revive Adserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21640?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21640 have an EU (EUVD) identifier?: Yes. CVE-2026-21640 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3329.
When was CVE-2026-21640 published?: CVE-2026-21640 was published on 2026-01-20 and last updated on 2026-06-17.

References

https://hackerone.com/reports/3445332

Affected products (1)

cpe:2.3:a:aquaplatform:revive_adserver:*:*:*:*:*:*:*:*

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Other CWE-134 vulnerabilities

CVE-2012-1851 — Critical (CVSS 10.0): Format string vulnerability in the Print Spooler service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2,…
CVE-2012-0242 — Critical (CVSS 10.0): Format string vulnerability in Advantech/BroadWin WebAccess before 7.0 allows remote attackers to execute arbitrary…
CVE-2011-2475 — Critical (CVSS 10.0): Format string vulnerability in ECTrace.dll in the iMailGateway service in the Internet Mail Gateway in OneBridge Server…
CVE-2011-1568 — Critical (CVSS 10.0): Format string vulnerability in the logText function in shmemmgr9.dll in IGSSdataServer.exe 9.00.00.11074, and…
CVE-2010-4235 — Critical (CVSS 10.0): Format string vulnerability in RealNetworks Helix Server 12.x, 13.x, and 14.x before 14.2, and Helix Mobile Server…
CVE-2011-0270 — Critical (CVSS 10.0): Format string vulnerability in nnmRptConfig.exe in HP OpenView Network Node Manager (OV NNM) 7.51 and 7.53 allows…

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