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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Yes. A cyberattack on a stock exchange or another essential market service could disrupt trading and, if participants have few alternatives, create knock-on effects across the financial system. But the evidence needs context: a 2012–13 survey found that many exchanges viewed cybercrime as a potential systemic risk; it did not measure today’s attack rate or show that an exchange attack had caused a systemic crisis.
Why an exchange cyberattack can matter beyond the exchange
Financial markets rely on connected services, not just the venue where an order is placed. Exchanges, clearing and settlement functions, communications, and market-data services help participants execute trades and complete transactions. If an essential service becomes unavailable, and there are few practical substitutes, the disruption may affect more than the organization directly attacked.
A cyber incident can target different things: a public website, a trading platform, market data, communications, clearing, settlement, or the integrity of records. An outage can delay or halt activity. A data-integrity incident could create a different problem: participants may be unsure whether prices, transactions, or records are accurate. The consequences depend on which function is affected, how long it is disrupted, how many participants depend on it, and how quickly reliable service can be restored.
What the 2012–13 exchange survey found
A joint staff working paper by the IOSCO Research Department and the World Federation of Exchanges (WFE), published on July 16, 2013, reported results from a survey conducted in 2012–13. Forty-six exchanges responded, representing 75% of those contacted. The figures below describe that respondent group and period; they are not current global incident statistics.
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| Survey finding | What it means |
|---|---|
| 53% of surveyed exchanges reported experiencing a cyberattack in the previous year. | A historical report by respondents, not an estimate of the current prevalence of attacks. |
| 89% of responding exchanges viewed cybercrime in securities markets as a potential systemic risk. | A measure of respondents’ concern, not the probability that an attack would cause systemic failure. |
| 46% said attacks had no organizational impact because of preventive and detection mechanisms. | Reported in SecurityWeek’s July 17, 2013 summary of the IOSCO/WFE study. |
| 21% reported some disruption or unavailability of production or web servers. | Also reported in SecurityWeek’s summary; this does not mean all affected services were core trading infrastructure. |
| 93% said cyber threats were discussed and understood by senior management, and 93% had disaster-recovery measures. | Historical preparedness responses reported in SecurityWeek’s summary, not a measure of current readiness. |
The study described denial-of-service attacks and malicious code, including viruses, as the most common reported attack forms. Respondents characterized attacks as tending toward disruption rather than immediate financial gain; financial theft did not feature in their survey responses. SecurityWeek’s summary also listed laptop and data theft, website scanning, and insider information theft. These are observations from the survey period, not a description of all cyberattacks on exchanges today.
The working paper said attacks had not affected core systems or market infrastructure in the survey’s account at that time. It warned, however, that future attacks could threaten market integrity, efficiency, and connected services. The authors also cautioned that the staff working paper should not be reported as representing IOSCO or WFE views.
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How an incident could become systemic
“Systemic risk” is more than a serious problem for one organization. It describes the possibility that disruption could spread through dependencies and impair broader market functioning. A plausible chain might look like this:
- A critical service is interrupted or its data becomes suspect. The affected function could be an exchange, a clearing or settlement service, market communications, or another essential connection.
- Participants cannot readily switch to an alternative. The impact is more consequential when many firms rely on the same service or when substitutes cannot take over quickly.
- Market activity is delayed, halted, or harder to complete reliably. Depending on the function affected, trading may be disrupted, settlement may be delayed, or participants may receive inconsistent information.
- Uncertainty can spread. Volatility, operational difficulties, and reduced confidence may affect connected participants. If records or prices cannot be trusted, restoring service alone may not resolve the uncertainty.
IOSCO and WFE presented these as potential scenarios, not outcomes demonstrated by the survey. The paper noted that cyber incidents had not produced systemic impacts in securities markets at the time and that there were no recognized thresholds for deciding when an incident becomes systemic. That uncertainty is why the 89% figure should be read as a warning about perceived potential, not proof that systemic failure had occurred or was inevitable.
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The 2020 New Zealand Stock Exchange disruption
Carnegie Endowment for International Peace’s 2020 strategy paper identifies a DDoS campaign against the New Zealand Stock Exchange in August 2020 that caused multi-day operational disruption. It is a concrete example of an availability problem affecting an exchange. The example does not, on its own, establish that the wider financial system was destabilized, nor does it show that all exchange attacks stop trading.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What helps limit disruption
The sources point to resilience as a combination of preparation across organizations, rather than a single product or control. Relevant practices include:
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- Prevention and detection: reduce the chance that an incident succeeds and identify suspicious activity quickly.
- Recovery planning: prepare how critical functions can be restored and how operations will continue during an outage.
- Staff preparedness: ensure relevant personnel understand their roles during an incident.
- Information sharing: coordinate with other financial institutions and public-sector bodies to improve awareness of threats.
- Exercises and testing: test response and recovery arrangements, including through threat-led testing approaches described by Carnegie.
These are institutional resilience measures; the cited sources do not endorse a particular vendor or consumer security product. Their effectiveness depends on the service involved, its dependencies, and the ability of connected organizations to coordinate.
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Sources and scope
- IOSCO Research Department and World Federation of Exchanges, Cyber-crime, securities markets and systemic risk (July 16, 2013). Joint staff working paper based on a survey conducted in 2012–13; it states that it should not be reported as representing IOSCO or WFE views.
- Fahmida Y. Rashid, SecurityWeek, “Cyber Attacks Against Stock Exchanges Threaten Financial Markets: Report” (July 17, 2013). Summary of the survey findings cited above.
- Carnegie Endowment for International Peace, International Strategy to Better Protect the Financial System Against Cyber Threats (2020). Later discussion of systemic pathways, the New Zealand Stock Exchange disruption, and resilience initiatives.
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