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ExploitedNot in CISA KEV yetFix available

CVE-2019-5434

Exploitation confirmed. First attested on 2026-03-09 by GCVE · kevintel, GCVE · shadowserver.

  • Published2019-05-06
  • Fixed in4.2.0
  • WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2019-05-0617:29CVE publishedNVD
  2. 2019-12-03Exploit-DB entryExploit-DB
  3. 2026-03-0911:38Listed as exploited by GCVEGCVE
  4. 2026-03-0911:38Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-5434?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-5434?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Revive-sas revive adserver
BranchAffectedFixed in
4.2< 4.2.04.2.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Revive-sas revive adserver to 4.2.0

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-47739
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • GCVEexploitation2026-03-09
  • NVDCVSS 3.09.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-502known since 2026-10-23
  • NVDweakness (CWE)CWE-502read 2026-10-23
  • FIRST EPSSEPSS score57.0 %read 2026-11-02
  • Exploit-DBdetectionread 2026-11-02
  • ProjectDiscoverydetectionread 2026-11-02

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2019-05-06
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2019-5434?

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.

Is CVE-2019-5434 actively exploited?

Active exploitation of CVE-2019-5434 has not been confirmed. Its EPSS score was 57.0% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-5434?

CVE-2019-5434 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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