CVE-2019-5434
CriticalExploitedPublic exploitAn attacker could send a specifically crafted payload to the XML-RPC invocation script and trigger the unserialize() call on the "what" parameter in the "openads.spc" RPC method.
Published May 6, 2019 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2019-5434 is a critical-severity vulnerability (CVSS 9.8 v3) affecting Revive Adserver (Revive-Sas).
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Mar 9, 2026. Public exploit code is available.
- EPSS estimates a 57% probability of exploitation in the next 30 days.
- Fixed versions are available, including Revive Adserver 4.2.0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3
9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
57%
Higher than 99.0% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
An attacker could send a specifically crafted payload to the XML-RPC invocation script and trigger the unserialize() call on the "what" parameter in the "openads.spc" RPC method. Such vulnerability could be used to perform various types of attacks, e.g. exploit serialize-related PHP vulnerabilities or PHP object injection. It is possible, although unconfirmed, that the vulnerability has been used by some attackers in order to gain access to some Revive Adserver instances and deliver malware through them to third party websites. This vulnerability was addressed in version 4.2.0.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Mar 9, 2026 | n/a | Not reported |
| CIRCL KEV | Mar 9, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Revive AdserverRevive-Sas | >= Fixed version v4.2.0 | 4.2.0 |
Patched Releases
Revive Adserver
4.2.0
Timeline
Publicly disclosed
May 6, 2019
Last updated
Nov 21, 2024
Added to Industry KEV feed
Mar 9, 2026
Added to CIRCL KEV
Mar 9, 2026
Weakness Type
- CWE-502 Deserialization of Untrusted Data
References
- advisoryhttps://hackerone.com/reports/512076
- advisoryhttps://hackerone.com/reports/542670
- advisoryhttps://www.revive-adserver.com/security/revive-sa-2019-001/
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
An attacker could send a specifically crafted payload to the XML-RPC invocation script and trigger the unserialize() call on the "what" parameter in the "openads.spc" RPC method.
Affected: Revive Adserver (Revive-Sas) versions >= Fixed version v4.2.0. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Mar 9, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Revive Adserver 4.2.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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