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Apexward Pulse
Type Vulnerability

Jenkins · Code execution

Jenkins Remote Code Execution Vulnerability

1 sourceCVE-2017-1000353

At a glance

Medium
7-day window, from the last update
ActiveConfirmed in-the-wild exploitation
Evidence-weighted, not popularity
Signal

Actively exploited in the wild — prioritise confirming exposure.

Why Medium

Medium rather than High: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on Jenkins, treat it as High.

Briefing

There is no written leader briefing for this story yet. These questions come from the facts we hold.

Questions to ask IT

  • Do we run Jenkins, and which versions?
  • Is any of it reachable from the internet?
  • Have we checked whether it has already been used against us?
  • If it is not yet patched, what mitigation is in place, and will the fix be done by 11 Nov?

Next steps

  1. Confirm exposure, mitigation status and any service interruption risk.

Summary

  • This vulnerability that could allowed attackers to transfer a serialised Java SignedObject object to the remoting-based Jenkins CLI, that would be deserialised using a new ObjectInputStream, bypassing the existing blocklist-based protection mechanism.
  • CVE-2017-1000353 is listed in known-exploited catalogue (exploitation in the wild)
  • CVE-2017-1000353 has estimated attack likelihood 0.99679 (~99.7% estimated chance of exploitation in 30 days; 99.9th percentile) as of 2026-07-31 — probability signal, not confirmed exploitation
  • Authoritative catalogues report active exploitation of this vulnerability.

Why this matters in the UK

  • Known-exploited catalogue reports exploitation in the wild

Products and services involved

  • Jenkins93% match confidence · CVE-2017-1000353

Pulse

Last checked 28m ago · Next recheck 10 Nov 2026, 03:39 UK time · 2 quiet checks collapsed

Update
9 Nov 2026, 03:39 UK time · 28m ago

held at 99.7%; ranking metadata was updated.

Listed on the — prioritise confirming exposure and patching.

EscalationDe-escalationCritical / liveWhat these mean
Drag to pan · Ctrl / ⌘ + scroll or pinch to zoom7 events

3 quiet checks hidden.

Sources

How we know

Statements extracted from sources. Higher confidence means stronger corroboration.

  • ConfirmedHeadline90% confidence

    Jenkins Remote Code Execution Vulnerability

  • ConfirmedSummary fact75% confidence

    Jenkins contains a remote code execution vulnerability. This vulnerability that could allowed attackers to transfer a serialized Java SignedObject object to the remoting-based Jenkins CLI, that would be deserialized using a new ObjectInputStream, bypassing the existing blocklist-based protection mechanism. Affects Jenkins Jenkins. Known ransomware campaign use: Unknown.

  • ConfirmedCVE identifier95% confidence

    Event involves CVE-2017-1000353

  • ConfirmedKnown-exploited catalogue98% confidence

    CVE-2017-1000353 is listed in known-exploited catalogue (exploitation in the wild)

  • ConfirmedEstimated attack likelihood95% confidence

    CVE-2017-1000353 has estimated attack likelihood 0.99679 (~99.7% estimated chance of exploitation in 30 days; 99.9th percentile) as of 2026-07-31 — probability signal, not confirmed exploitation