CVE Intelligence
Low Memory corruption exploit reference

CVE-2025-52666 — Use of Externally-Controlled Format String in Revive Adserver

Improper neutralisation of format characters in the settings of Revive Adserver 5.5.2 and 6.0.1 and earlier versions causes an administrator user to disable the admin user console due to a fatal PHP error.

Published Nov 20, 2025 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: hackerone

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.4% (30-day exploitation probability)+5
  • CISA SSVC: exploitation "poc"+5

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.42%
ahead of 35% of scored CVEs · Oct 14, 2026
Affects
Revive
Adserver and 1 more
CVSS base
2.7
Low · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
Proof of concept
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Partial
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Revive Adserver, Revive-adserver Revive Adserver).
  2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  3. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Revive Adserver ≥ 6.0.1 and ≤ 6.0.1≥ 5.5.2 and ≤ 5.5.2 Vulnerable CVE Program (cve.org) e CISA ADP
Revive-adserver Revive Adserver ≤ 5.5.2≥ 6.0.0 and ≤ 6.0.1 Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
2.7 CVSS 3.0 Low 1.2 1.4 support@hackerone.com via NIST National Vulnerability Database
2.7 CVSS 3.0 Low — — hackerone via CVE Program (cve.org) e CISA ADP
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L (score shown at the top: support@hackerone.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-134 · Use of Externally-Controlled Format String

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.42%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
web/proxy/WAF logsnetwork IDS/IPSendpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · revive/revive adserver
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • CVSS changed · 2.7
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 13, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 13, 2026 · NIST National Vulnerability Database
  • 2025
  • CVE published
    Nov 20, 2025 · hackerone

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

Elsewhere on this site

Revive
every CVE for this vendor
Memory corruption
same class
CWE-134
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-50743 Cross-Site Request Forgery (CSRF) in Revive Adserver Jul 20, 2026
  • CVE-2026-50745 Cross-site Scripting (XSS) in Revive-adserver Revive Adserver Jun 25, 2026
  • CVE-2026-50739 Improper Access Control in Revive-adserver Revive Adserver Jun 25, 2026
  • CVE-2026-50744 Improper Access Control in Revive-adserver Revive Adserver Jun 25, 2026
  • CVE-2026-50742 Cross-site Scripting (XSS) in Revive-adserver Revive Adserver Jun 25, 2026
  • CVE-2026-50741 Code Injection in Revive-adserver Revive Adserver Jun 25, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-52666 is "Use of Externally-Controlled Format String in Revive Adserver", rated Low. It affects Adserver (Revive); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 2.7 describes technical severity. EPSS 0.42% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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